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arxiv: 1611.02543 · v1 · pith:3GEEBVLCnew · submitted 2016-11-08 · 🧮 math.LO

Equivalents of disjunctive Markov's principle

classification 🧮 math.LO
keywords principledisjunctiveequivalentsexamplemarkovclassicallyconstructiveequivalent
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The purpose of this short note is to point out a rich source of natural equivalents of the weak semi-intuitionistic principle MP$^\vee$ in reverse constructive mathematics: many simple theorems from Euclidean geometry when read classically (for example with $<$ interpreted as $\leqslant$ and $\neq$) are equivalent to disjunctive Markov's principle MP$^\vee$. We give an example of this phenomenon.

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