A Man Who Questioned Everything
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While the dictionary definition is a little stuffy ("an ancient Greek school of philosophy founded at Athens by Zeno of Citium. The school taught that virtue, the highest good, is based on knowledge; the wise live in harmony with the divine Reason (also identified with Fate and Providence) that governs nature, and are indifferent to the vicissitudes of fortune and to pleasure and pain.") a more approachable view is to simply be grateful for the good things one has and appreciate them, understanding that things could always be worse. A form of optimism, if you will, but one that should be moderate.
The extreme of this was parodied by Dr. Pangloss in Candide, by the French philosopher Voltaire. No matter the horrors the good Doctor observed or the fates which befell him (war, murder, disease, pestilence, etc.) he always absurdely celebrated what he found and proclaimed the majesty and greatness of this, "the Best Of All Possible Worlds!" Voltaire's mockery of contemporary philosophers via this character was as entertaining as it was thorough.
Finding a balance is key.
[1] https://en.m.wikipedia.org/wiki/De_rerum_natura
[2] Stated in his Optics.
A brief Google suggests the term hasn't been used much since the 19th Century, but could mean either that everything is made of indivisible atoms, or that matter is made up of indivisible atoms. However, we've known for a long time that atoms are not indivisible.
Looking at your last link, perhaps you mean more that "everything is mass"? But quantum field theory as described in that article has been around since at least the 70s, and I think physicists and philosophers would still regard quantum field theory as a materialist theory. In modern usage, "materialism" is synonymous with "physicalism", i.e. that everything is physical [0]. Most physicists would call themselves materialists.
I ask because the same article was posted over a year ago and someone made a very similar looking comment [1].
> Physicalism is true at a possible world w iff any world which is a physical duplicate of w is a duplicate of w simpliciter.
Popper's attempted solution was to say that implicit in "brought to the attention of the senses" is a requirement that one's physical model generates falsifiable predictions of future observations. Thus astrology cannot be said to be part of a physicalist worldview, since horoscopes are so open to interpretation that they cannot be falsified.
That said, some notions of deities could be said to be physical, for example the proposition that there is a skygod who will make it rain if you say a certain prayer. This is not unphysical in this sense; it's just wrong. What would make it unphysical if you started moving the goalposts arbitrarily, for example "oh, it will cause rain next year instead" or "oh, you just weren't praying with true belief in your heart".
In my mind this demonstrates 'physical' is not very well defined by physicalism, since souls etc. are considered to be non-physical, yet could in theory meet the requirements of physicalism.
Also the word "physical" has a different usage amongst philosophers than amongst laymen. In philosophy, a thought or idea might be thought of as physical since it is a property or pattern of neurological activity, but the average person would not say a thought was physical.
Thanks for noting this distinction. Come to think of it and in light of what you wrote re physicalism, I would think that I want to distinguish the two kinds of materialism. The one is a vague and general notion (“everything is physical”) and the other is a well-defined view of the world. According to this view, there exists absolutely indivisible units called atoms and empty space where these atoms move. I think "atomic materialism" emphasizes that we are talking about a world made of indivisible atoms. I think the other view does not take indivisibility as a strict requirement.
I do not agree with your statement that "we've known for a long time that atoms are not indivisible." Lucretius makes very clear that atoms are forever indivisible entities. So, _by definition_, we call an indivisible object an atom. If it is divisible it is not an atom, according to the original definition of the word.
What happened is that, physicists named an object an "atom" and when they resolved that object they named "atom" into its constituent parts, they claimed to have divided an indivisible atom. No. This is only a play on words.
Unfortunately, we see this process of loading old words with new meanings in physics all the time. No definition is sacred in physics. As you wrote, "In modern usage, 'materialism' is synonymous with 'physicalism'." This simply means that physicists changed the meaning of the word "material."
This process confuses me a lot. I even have a short essay about why physics must be semantics.
https://docs.google.com/presentation/d/1lV91S8enG4TqkxfO3XkA...
I agree that terminology is especially fickle in physics, and it can be very confusing. Words need to be co-opted in order to discuss the objects of a new theory, and often they are simply chosen by rough analogy. The "mass" of Newton's spacetime is not the "mass" of Einstein's relativity. The "spin" of an electron is not the same as the spin of a car's wheel.
John Stewart Bell has a nice quotation about this when discussing the use of the word "measurement" in quantum theory:
> Take for example the “strangeness”, “charm”, and “beauty” of elementary particle physics. No one is taken in by this “baby talk”. ... Would that it were so with “measurement”. But in fact the word has had such a damaging effect on the discussion, that I think it should now be banned altogether in quantum mechanics.
As for atomism more broadly, now that I think about it there are some modern theoretical physicists with ideas about the discretisation of spacetime, for example: https://arxiv.org/abs/1312.2852