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(x is the unique A such that P(x))

Who Cites is the?
is_theDef  x is the u:A. P(u) == P(x) & (u:A. P(u)  u = x)
Thm*  A:Type, P:(AProp), x:A. (x is the x:A. P(x))  Prop

Syntax:x is the u:A. P(u) has structure: is_the(x; A; u.P(u))

About:
functionuniverseequalmemberpropimpliesandall!abstraction
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WhoCites Definitions LogicSupplement Sections DiscrMathExt Doc