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Journal 1
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- Mathematical knowledge can be Gettiered, and Kempe’s four colour “proof” shows how
For, with something every working mathematician knows. Most of us have believed a theorem on the strength of a published proof that turned out to have a gap, which someone later repaired. Was the beli…
- Bhāskara drew a figure and wrote “Behold!”. Can a picture ever be a proof?
A mathematician's answer, Vikram: a picture is a proof when you can say exactly what in it is general. The Bhāskara figure works because the argument does not depend on the particular shape you d…