source of the "random" bug

[David Eisenbud]

I had put

HomologicalAlgebraPackage = "Complexes"

into my init.m2 file to make the switch from "ChainComplexes".

When I commented that out, the bug disappeared.

--

David Eisenbud

Professor of Mathematics

University of California Berkeley

https://eisenbud.github.io/

[Mahrud Sayrafi]

This is strange. Do you mean the issue specifically in your package disappeared or the example you provided? I think the bug is still there when I run your example using either Complexes or OldChainComplexes.

Mahrud

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[David Eisenbud]

You are right, the bug is there both ways. But for example if S = k[t] then

random(S^1, S^2)

works correctly (ie the old way.) I mistakenly tested the "bug" on that example when I said

it was only there without the new Complexes.

David

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David Eisenbud

Professor of Mathematics

University of California Berkeley

https://eisenbud.github.io/

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[Mahrud Sayrafi]

That makes sense. The case where source and target are free is handled differently.

Mahrud

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[David Eisenbud]

I would like to get your fix into my systems, so that I can use the package that is failiing (to do with finding summands). What's the best way to do that?

thanks,

David

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David Eisenbud

Professor of Mathematics

University of California Berkeley

https://eisenbud.github.io/

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[Mahrud Sayrafi]

I'm not sure what's the best way, but the most immediate way is this: type "locate (random, Module, Module)", click on the filename and press enter to open the file, then in the second line of the method swap F and G.

It might make sense to have a quick patch release, but maybe we should wait a few days to see if any other bugs are revealed.

Mahrud

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[David Eisenbud]

Thanks - done! Do I need to brew M2 again after this?

David

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David Eisenbud

Professor of Mathematics

University of California Berkeley

https://eisenbud.github.io/

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[Mahrud Sayrafi]

No, if you do that I think it'll undo the fix.

Mahrud

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[David Eisenbud]

Thanks -- everything is now working (had to add LengthLimits in quite a few places, too.)

David

--

David Eisenbud

Professor of Mathematics

University of California Berkeley

https://eisenbud.github.io/

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