Michael Barr

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Name Michael Barr
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Square root of a positive $C^\infty$ function.

aug 25 at 4:40 Dick Palais 10k●1●38●61

 
15
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553
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No injective groups with more than one element?

jun 21 at 17:04 Theo Buehler 3,666●1●11●25

 
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When UFD implies PID

jun 10 at 12:56 Michael Barr 545●1●7

 

 

 

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There are two slightly different notions of ultraproduct. Why is one said to be better than the other?
4
Is there a standard name for a 2-category which has an object z such that, for every object x, the category Hom(x,z) has a terminal object?
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Archimedean Property of Real Numbers

 

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