metaphysics

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Metaphysics (plato.standford.edu) It is not easy to say what metaphysics is. Ancient and Medieval philosophers might have said that metaphysics was, like chemistry or astrology, to be defined by its subject-matter: metaphysics was the “science” that studied “being as such” or “the first causes of things” or “things that do not change”.

There are metaphysical problems, which cannot be disposed of by declaring them meaningless. For, as I have repeatedly said, they are “beyond physics” indeed and demand an act of faith. We have to accept this fact to be honest. There are two objectionable types of believers: those who believe the incredible and those who believe that “belief” must be discarded and replaced by “the scientific method.” Max Born, Natural Philosophy of Cause and Chance (1964)
Mathematics is the only true metaphysics. William Thomson, as quoted by Silvanus Phillips Thompson
metaphysics

Metaphysics (Wikipedia) Metaphysics is the branch of philosophy that studies the fundamental nature of reality. This includes the first principles of: being or existence, identity, change, space and time, cause and effect, necessity, actuality, and possibility.