Urelements

Urelement

In set theory, a branch of mathematics, an urelement or ur-element (from the German prefix ur-, 'primordial') is an object that is not a set, but that may be an element of a set. It is also referred to as an atom or individual. (Wikipedia).

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From playlist BIOLOGY: Physiology

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From playlist Injective, Surjective, and Bijective Functions

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From playlist Science Unplugged: Particle Physics

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From playlist Injective, Surjective, and Bijective Functions

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Equiconsistency | Kripke–Platek set theory with urelements | Non-well-founded set theory | Set theory | Aczel's anti-foundation axiom | Axiom of infinity | Axiom of extensionality | Principle of explosion | New Foundations | Finitist set theory | Zermelo–Fraenkel set theory | Element (mathematics) | Axiom of regularity | Mathematics | Set (mathematics) | Consistency | Axiomatic system | Zermelo set theory | Type theory | Structure (mathematical logic) | Class (set theory) | Willard Van Orman Quine | Von Neumann–Bernays–Gödel set theory | Jon Barwise