New posts in alternative-set-theories

ZF Set Theory and Law of the Excluded Middle

logic set-theory constructive-mathematics alternative-set-theories

Is there a contradiction hiding in this alternative set theory with 3 axioms?

logic foundations alternative-set-theories

Set theory with antielements?

reference-request alternative-set-theories

Is there a non-standard set theory that makes use of a null element?

logic reference-request notation alternative-set-theories

Is there a set theory in which the reals are not a set but the natural numbers are?

set-theory alternative-set-theories

Alternative set theories

soft-question set-theory education alternative-set-theories

Why use ZF over NFU?

set-theory alternative-set-theories

Positive set theory, antifoundation, and the "co-Russell set"

set-theory foundations alternative-set-theories logic