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Who's watching: Can maths exist if you can't see it?
We explore non-constructive proofs and what happens if you try and avoid them.
Content about “ intuitionist mathematics
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Article
Intuitive mathematics
Can a mathematical object be said to exist if you can't construct it?
Article
Constructive mathematics
If you like mathematics because things are either true or false, then you'll be worried to hear that in some quarters this basic concept is hotly disputed. In this article Phil Wilson looks at constructivist mathematics, which holds that some things are neither true, nor false, nor anything in between.