His reply:The French physicist, philosopher and historian of physics Pierre Duhem would agree with you, Dr. Oerter, that physical theories do not depend upon a choice of metaphysics. Duhem masterfully shows this, with many historical examples, in his classic philosophy of science work The Aim and Structure of Physical Theory (excerpt). He also treats this in "Physics & Metaphysics," "Physics of a Believer," and this excerpt from To Save the Phenomena.
Thanks, that's very helpful. From the second link:My response:
"That Physics Logically Precedes Metaphysics
...We cannot come to know the essence of things except insofar as that essence is the cause and foundation for phenomena and the laws that govern them. The study of phenomena and laws must therefore precede the investigation of causes."
That's what I was groping for in my attempts to answer Feser.
However, I think there's a distinction that must be made between the metaphysical essences that Duhem is talking about and the metaphysical principles that Feser is talking about. Don't we need concepts of cause and change before we can even begin a physical investigation?
Your question appears to be a question on the method and division of the sciences. Boethius, following Aristotle, proposed that the "Speculative sciences may be divided into three kinds: physics, mathematics, and metaphysics.":
(cf. §II of his De Trinitate)
- Physics [(the natural sciences)] deals with that which is in motion and material [(ens mobile or "mobile being")].
- Mathematics deals with that which is material and not in motion [(∵ mathematical objects, or "mathematicals," do not move or change)].
- Metascience deals with that which is not in motion nor material.
In this context, Thomas Aquinas writes in his Division and methods of the sciences, a commentary on Boethius's De Trinitate questions V and VI (my adapted translation follows):q. 5 a. 1 objection 9: That science on which others depend must be prior to them. Now all the other sciences depend on metascience because it is its business to prove their principles. Therefore Boethius should have placed metascience before the others.
reply to objection 9: Although metascience is by nature the first of all the sciences, with respect to us the other sciences come before it. For as Avicenna says, the position of metascience is that it be learned after the natural sciences, which explain many things used by metascience, such as generation, corruption, motion, and the like [(e.g., actuality, potentiality, matter, form, etc.)]. It should also be learned after mathematics […]. […] Nor is there necessarily a vicious circle because metascience presupposes conclusions proved in the other sciences while it itself proves their principles. For the principles that another science (such as natural philosophy) takes from first philosophy [(i.e., from metascience)] do not prove the points which the first philosopher [(metascientist)] takes from the natural philosopher, but they are proved through other self-evident principles. Similarly, the first philosopher does not prove the principles he gives the natural philosopher by principles he receives from him, but by other self-evident principles. So there is no vicious circle in their definitions. Moreover, the sensible effects on which the demonstrations of natural science are based are more evident to us in the beginning. But when we come to know the first causes through them, these causes will reveal to us the reason for the effects, from which they were proved by a demonstration quia [(i.e., a demonstration a posteriori, a demonstration from effects to causes)]. In this way natural science also contributes something to metascience, and nevertheless it is metascience that explains its principles. That is why Boethius places metascience last, because it is the last relative to us (quoad nos).See The Way toward Wisdom by Benedict Ashley (read the first chapter, this excerpt, John Deely's review). His main theses are that:
- the natural sciences are epistemologically prior to metaphysics
- metaphysics, which he proposes we term "metascience," is the true philosophy of science.
In sciences, physical and physico-mathematical, those facts which exist independently of our mind are considered certain, as laws which express constant relations among phenomena. Postulates, hypotheses, are defined by their relation to the truth to be attained, not as yet accessible or certain. To illustrate. On the principle of inertia, many scientists hold that inertia in repose is certain, meaning that a body not acted upon by an exterior cause remains in repose. But others, H. Poincare, for example, or P. Duhem, see in this view a mere postulate suggested by our experience with inertia in movement, which means that "a body already in motion, if no exterior cause acts upon it, retains indefinitely its motion, rectilinear and uniform." Experience suggests this view, because as obstacles diminish, the more is motion prolonged, and because "a constant force, acting on a material point entirely free, impresses on it a motion uniformly accelerated," as is the motion of a falling body. But the second formula of inertia, as applied to a body in repose, is not certain, because, as Poincare [La science et l'hypothese, pp. 112-19. of French original] says: "No one has ever experimented on a body screened from the influence of every force, or, if he has, how could he know that the body was thus screened?" The influence of a force may remain imperceptible.
Inertia in repose, then, remains a postulate, a proposition, that is, which is not self-evident, which cannot be proved either a priori or a posteriori, but which the scientist accepts in default of any other principle. The scientist, says P. Duhem, has no right to say that the principle is true, but neither has he the right to say it is false, since no phenomenon has so far constrained us to construct a physical theory which would exclude this principle. It is retained, so far, as guide in classifying phenomena. This line of argument renders homage to the objective notion of truth. We could not reason thus under truth's pragmatic definition.
—Reality Chapter 57: Realism And Pragmatism, III. Pragmatic Consequences
if there is no substance other than those which exist in the way that natural substances do, with which the philosophy of nature deals, the philosophy of nature will be the first science. But if there is some immobile substance, this will be prior to natural substance, and therefore the philosophy which considers this kind of substance, will be first philosophy.Also, check out the 8 tenets of River Forest / Aristotelian Thomism, which are elaborated in The Way toward Wisdom (vide the first chapter, this excerpt, John Deely's review) by Benedict Ashley, O.P., which discusses the question "What is metaphysics?"
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73. Nevertheless, Venerable Brethren and beloved children, We wish to call your attention in a special manner to the present-day lamentable decline in family education. The offices and professions of a transitory and earthly life, which are certainly of far less importance, are prepared for by long and careful study; whereas for the fundamental duty and obligation of educating their children, many parents have little or no preparation, immersed as they are in temporal cares. The declining influence of domestic environment is further weakened by another tendency, prevalent almost everywhere today, which, under one pretext or another, for economic reasons, or for reasons of industry, trade or politics, causes children to be more and more frequently sent away from home even in their tenderest years. And there is a country where the children are actually being torn from the bosom of the family, to be formed (or, to speak more accurately, to be deformed and depraved) in godless schools and associations, to irreligion and hatred, according to the theories of advanced socialism; and thus is renewed in a real and more terrible manner the slaughter of the Innocents.
The legitimate, sure and fruitful method of preparing a student to receive a physical hypothesis is the historical method. To retrace the transformations through which the empirical matter accrued while the theoretical form was first sketched; to describe the long collaboration by means of which common sense and deductive logic analyzed this matter and modeled that form until one was exactly adapted to the other: that is the best way, surely even the only way, to give to those studying physics a correct and clear view of the very complex and living organization of this science [emphasis added] (Duhem, P.: 1905/1954, ‘The Aim and Structure of Physical Theory’, Princeton University Press, Princeton, NJ, p. 268).Ernst Mach also advocated the history and philosophy of science (HPS) teaching method:
A person who has read and understand the Greek and Roman authors has felt and experiencedmore than one who is restricted to the impression of the present. He sees how men, placed in different circumstances, judge quiet differently of the same things from what we do today. His own judgments will be rendered thus more independent (Mach, E.: 1886/1986, ‘On instruction the Classics and the Sciences’, In: ‘Popular Scientific Lectures’, Open Court Publishing Company, La Sale, IL., p. 347).Igal Galili, author of "Experts’ Views on Using History and Philosophy of Science in the Practice of Physics Instruction," wrote to me that the historical method "presents a great controversy in university physics textbooks of physics."
Of course we want to hear about mathematics!
You should do some posts on Thomism and mathematics. The literature out there on St. Thomas's conception of mathematics seems very sparse. I especially would like to see some studies of how a Thomist views calculus, infinitesimals, etc.
There are some things, for example: My quotes of St. Thomas on mathematics; ch. 6 of Mullahy's Thomism & Mathematical Physics (PDF pgs. 264 ff.) is entitled "The Nature of Mathematical Abstraction"; "A neglected Thomistic text on the foundation of mathematics" by Armand A Maurer; and St. Thomas on the object of geometry by Vincent Edward Smith. These are all online for free.
Also, if you don't know about Augustin-Louis Cauchy, read this Dictionary of Scientific Biography article on him. I quote it: "More concepts and theorems have been named for Cauchy than for any other mathematician (in elasticity alone there are sixteen concepts and theorems named for Cauchy)." In his Cours d'Analyse, he proved the Fundamental Theorems of Calculus and Algebra, described partial fraction decomposition, devised convergence tests, and was the first to devise the ε-δ formulation of the limit (cf. this article by a prominent Cauchy historian; I love how it begins! A proper understanding of calculus is absolutely vital for understanding the power and limits of modern mathematical physics.). Of course Cauchy is also famous for complex integrals. Since he was a devout Catholic, I've been wondering if he was well-versed in Thomism. He studied classics before becoming a mathematician, so it's possible. I'm not sure he wrote any treatise on the philosophy of mathematics, though.
My follow-up:
Definitely read St. Thomas's In Boethium De Trinitate, q. 5, a. 3: "Does Mathematics Treat, Without Motion and Matter, of What Exists in Matter?". (Questions 5 and 6 of In Boethium De Trinitate are also called St. Thomas's Division and Methods of the Sciences.) Cf. also St. Thomas's commentary In II Phys. lect. 3.
From what I have read, it seems that Aristotelian philosophy of mathematics does well making sense of the everyday mathematics your average person on the street uses, e.g. arithmetic, combinatorics, geometry, and other discrete disciplines.Aristotle and St. Thomas certainly distinguished discrete and continuous quantity (cf. Summa I q. 3 a. 3: "punctum non est principium nisi quantitatis continuae, et unitas quantitatis discretae": "a point is the principle of continuous quantity alone; and unity, of discontinuous quantity").
However, like you say, it would be interesting to see if an account of infinitesimals, calculus, the larger infinities, etc. could be given, while remaining a realist (rather than nominalist) theory of mathematics.St. Thomas, in his commentary on Aristotle's Physics, deals very well with the "mathematical nominalist objection" to actual infinities in nature (be they infinitely large {cardinalities of Cantor sets}, infinitely small {infinitesimals}, etc.): From In III Phys. lect. 7:
[...] [Aristotle] says that it is impossible for the infinite to be separated from sensible things, in such a way that the infinite should be something existing of itself, as the Platonists laid down. For if the infinite is laid down as something separated, either it has a certain quantity (namely, continuous, which is size [magnitudo], or discrete, which is number [multitudo]), or not. If it is a substance without either the accident of size or that of number, then the infinite must be indivisible—since whatever is divisible is either number or size. But if something is indivisible, it will not be infinite except in the first way, namely, as something is called “infinite” [viz., "not finite"]So, it appears the mathematical nominalists are correct when it comes to mathematicals indirectly "separated [abstracted] from sensible things" (e.g., ∞, א, irrationals, etc., which are only ens rationis, "beings of reason" or "mind-dependent beings"), but they are incorrect in claiming that mathematicals of discrete (e.g., the number 2) and continuous quantity (e.g., a regular dodecahedron) can only be ens rationis (or our names of those ens rationis). The issue boils down to whether or not actual infinities exist in nature (cf., e.g., the whole Physics lecture above or the Summa questions: "Whether an actually infinite magnitude [magnitudo] can exist?" and "Whether an infinite multitude [multitudo] can exist?").which is not by nature susceptible to being passed through[better translation: "which is not surpass-able"], in the same way that a sound is said to be “invisible” [as not being by nature susceptible to being seen], but this is not what is intended in the present inquiry concerning the infinite, nor by those who laid down the infinite. For they did not intend to lay down the infinite as something indivisible, but as something that could not be passed through, i.e., as being susceptible to such, but with the passage having no completion.
Also, Pierre Duhem—an early 20th century French, Catholic, Thomist physicist, philosopher of physics, and founder of the discipline of the history of medieval physics—wrote, contrary to Poincaré, that mathematical induction can be reduced to a finite syllogistic process.
Happy Easter!
This use of form (Aristotle's μορφή or εἶδος) and matter (ὕλη) is a metaphorical extension of their popular use. In ordinary speech, a portion of matter, stuff, or material, becomes a 'thing' by virtue of having a particular 'form' or shape; by altering the form, the matter remaining unchanged, we make a new 'thing'. This language, primarily applied only to objects of sense, was in philosophical use extended to objects of thought: every 'thing' or entity was viewed as consisting of two elements, its form by virtue of which it was different from, and its matter which it had in common with, others.Thus the soul is the form of a living body.
Sed quid igitur sum? res cogitans: quid est hoc? nempe dubitans, intelligens, affirmans, negans, volens, nolens, imaginans quoque, & sentiens.The Oxford English Dictionary defines res extensa as "Matter, material substance; a material body."
[But what therefore am I? A thinking thing: what is this? Certainly a doubting, intelligent, affirming, denying, willing, unwilling, imagining, & sentient thing.]
was a quantitative version of the concept of 'potentia' [potency] in Aristotelian philosophy (p. 41)and that the
concept of the soul for instance in the philosophy of [Saint] Thomas Aquinas was more natural and less forced than the Cartesian concept of 'res cogitans,' even if we are convinced that the laws of physics and chemistry are strictly valid in living organisms. (p. 80)
For what is time? Who can easily and briefly explain it? Who even in thought can comprehend it, even to the pronouncing of a word concerning it? But what in speaking do we refer to more familiarly and knowingly than time? And certainly we understand when we speak of it; we understand also when we hear it spoken of by another. What, then, is time? If no one ask of me, I know; if I wish to explain to him who asks, I know not. Yet I say with confidence, that I know that if nothing passed away, there would not be past time; and if nothing were coming, there would not be future time; and if nothing were, there would not be present time. Those two times, therefore, past and future, how are they, when even the past now is not; and the future is not as yet? But should the present be always present, and should it not pass into time past, time truly it could not be, but eternity. If, then, time present—if it be time—only comes into existence because it passes into time past, how do we say that even this is, whose cause of being is that it shall not be—namely, so that we cannot truly say that time is, unless because it tends not to be?I also enjoyed Dr. Barr's God/creation, author/book analogy to illustrate primary versus secondary causality.
—St. Augustine's Confessions XI, ch. 14
"If you want to be more creative," wrote the [child] psychologist Jean Piaget, "stay in part a child, with the creativity and invention that characterizes children before they are deformed by adult society."
J. Robert Oppenheimer agreed: "There are children playing in the streets who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago." [This corroborates Nihil est in intellectu quod prius in sensu!]
Thomas Edison agreed too: "The greatest invention in the world is the mind of a child." So did Will Durant: "…the child knows as much of cosmic truth as Einstein did in the ecstasy of his final formula." [Although the former and latter are cœnoscopic and ideoscopic knowledge, respectively]
Which is curiously close to what Albert Einstein himself said: "I sometimes ask myself how it came about that I was the one to develop the theory of relativity. The reason, I think, is that a normal adult never stops to think about problems of time and space. These are things that he has thought of as a child. But my intellectual development was retarded, as a result of which I began to wonder about space and time only when I had already grown up."[...]"Kids are natural-born scientists," said Carl Sagan. "First of all, they ask the deep scientific questions: Why is the moon round? Why is the sky blue? What's a dream? Why do we have toes? What's the birthday of the world? By the time they get into high school, they hardly ever ask questions like that."
"Children enter school as question marks and leave as periods," agreed Neil Postman.
Become a question mark again.—How to Get Ideas (p. 27-30) by Foster & Corby
§4. The Divisions of Science
238. [...] All knowledge whatever comes from observation; but different sciences are observational in such radically different ways that the kind of information derived from the observation of one department of science (say natural history) could not possibly afford the information required of observation by another branch (say mathematics). [...]
239. I recognize two branches of science: Theoretical, whose purpose is simply and solely knowledge of God's truth; and Practical, for the uses of life. In Branch I, I recognize two subbranches, of which, at present, I consider only the first, [the sciences of discovery]. Among the theoretical sciences [of discovery], I distinguish three classes, all resting upon observation, but being observational in very different senses.†P1
240. The first is mathematics, which does not undertake to ascertain any matter of fact whatever, but merely posits hypotheses, and traces out their consequences. It is observational, in so far as it makes constructions in the imagination according to abstract precepts, and then observes these imaginary objects, finding in them relations of parts not specified in the precept of construction. This is truly observation, yet certainly in a very peculiar sense; and no other kind of observation would at all answer the purpose of mathematics.†P2
241. Class II is philosophy, which deals with positive truth, indeed, yet contents itself with observations such as come within the range of every man's normal experience, and for the most part in every waking hour of his life. Hence Bentham calls this class, coenoscopic.†1 These observations escape the untrained eye precisely because they permeate our whole lives, just as a man who never takes off his blue spectacles soon ceases to see the blue tinge. Evidently, therefore, no microscope or sensitive film would be of the least use in this class. The observation is observation in a peculiar, yet perfectly legitimate, sense. If philosophy glances now and then at the results of special sciences, it is only as a sort of condiment to excite its own proper observation.
242. Class III is Bentham's idioscopic†2; that is, the special sciences, depending upon special observation, which travel or other exploration, or some assistance to the senses, either instrumental or given by training, together with unusual diligence, has put within the power of its students. This class manifestly divides itself into two subclasses, the physical and the psychical sciences; [...]
NOTES†P1 Some catholic writers recognize sciences resting upon authority. No doubt, everybody of good sense believes some things substantially because he has been brought up to do so; but according to my conception of what science is, that is not science. Indeed, belief proper has nothing to do with science. [Baldassare] Lablanca [Dialettica, vol. II, lib. IV, c. 1, 1875] admits a class of documentary sciences. This is more plausible; although, as that author admits, documentary evidence enters into every science, while nothing can have rested wholly on documentary evidence to the original authors of the documents. He reckons as documentary sciences, history, linguistics, political economy, statistics, and geography. But it is quite plain that these do not form a natural group; especially since this geography must include physical geography.
†P2 Many writers of France (as Comte and Ribot), and of Germany (as Schopenhauer and Wundt), and a few in England (as Cave), have given mathematics the first place among the sciences, contrary to the doctrine of Plato and Aristotle, which has caused so many to place it below philosophy in point of abstractness. I mention this to show that I am taking no revolutionary position here: I am open to charges enough of heresy to answer to, to make me desire to avoid those that can be avoided.
†1 "Coenoscopic . . . from two Greek words, one of which signifies common — things belonging to others in common; the other looking to. By coenoscopic ontology, then, is designated that part of the science which takes for its subject those properties which are considered as possessed in common by all the individuals belonging to the class which the name ontology is employed to designate, i.e. by all individuals." The Works of Jeremy Bentham, Edinburgh, 1843, viii, 83, footnote.
See also the semiotician John Deely's Purely Objective Reality (2009) for more on the difference and similarities between ideoscopy and cœnoscopy, which is relevant to understand how modern science relates to our sense perception of the world.†2 "Idioscopic . . . from two Greek words, the first of which signifies peculiar. In Idioscopic ontology, then, we have that branch of art and science which takes for its subject such properties as are considered as peculiar to different classes of beings, some to one such class, some to another." Ibid.
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