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Extensionality versus constructivity
- Mathematical logic Quarterly
, 2000
"... We will analyze some extensions of Martin-Löf’s constructive type theory by means of extensional set constructors and we will show that often the most natural requirements over them lead to classical logic or even to inconsistency. 1 ..."
Abstract
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We will analyze some extensions of Martin-Löf’s constructive type theory by means of extensional set constructors and we will show that often the most natural requirements over them lead to classical logic or even to inconsistency. 1

