Markov's principle, named after Andrey Markov Jr, is a statement in computability theory that  is logical validity classically  not in intuitionistic constructive mathematics.
<meaning-changed> Markov's principle, named after Andrey Markov Jr, is a statement in computability theory that  is logical validity classically  not in intuitionistic constructive mathematics.
Markov's principle, named after Andrey Markov Jr, is a conditional existence statement for which there are many equivalent formulations, as discussed below. is logical validity classically not in intuitionistic constructive mathematics.