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# Questions

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3
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### Why are spectra indexed over the natural numbers?

sep 9 10 at 8:54 roger123 1,662519

4
2
3
811
views

### Internal hom of sheaves

may 14 10 at 16:19 Urs Schreiber 6,4781321

1
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1
520
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### Question on an exercise in Hartshorne: Equivalence of categories

mar 23 10 at 13:21 Charles Siegel 10.8k23181

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1
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1
248
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### Closure of the homotopy relation for a simplicial set

jun 27 10 at 3:26 Tom Goodwillie 26.8k260110

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1
359
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### Question on the interpretation of a presheaf category as a co-completion

mar 25 11 at 1:41 Todd Trimble 22.3k16396

1
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3
407
views

### Distributivity / commutativity of pushouts and pullbacks

nov 18 10 at 9:23 Martin Brandenburg 29.1k246130

1
0
1
110
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### Is there a map of spectra implementing the inverse of the Thom isomorphism?

aug 26 11 at 9:01 Johannes Ebert 11.5k3356

1
0