extensionality axiom外延公理;外延性公理;外延原则;翻译
extensionality principle外延性原则
axiom of extensionality[数] 外延公理;[数] 外延性公理;公理
extensionality and intensionallty外延性与内涵性
principle of extensionality外延性原则
the rule of weak extensionality弱外延规则
semi-valuation with extensionality外延半赋值
N（名词） the principle that sets are definable in terms of their elements alone, whatever way they may have been selected. Thus {a, b}={b, a}={first two letters of the alphabet} 外延性原则 [logic]