রুহুল's world

রুহুল

♠Geometry
♠Set theory
♠PC hardware/rigging/BIOS
♠Logical forms
♠Control engineering
♠Bodybuilding
♠Military field ops tech
♠Biomechanics

The notion of a "set" is taken as an undefined primitive in axiomatic set theory, and its properties are defined by the Zermelo--Fraenkel axioms. The most basic properties are that a set "has" elements, and that two sets are equal (one and the same) if and only if they have the same elements.

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