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Products and sums of morphisms in FinSet #449

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kris-brown opened this issue Jul 7, 2021 · 1 comment · Fixed by #459
Closed

Products and sums of morphisms in FinSet #449

kris-brown opened this issue Jul 7, 2021 · 1 comment · Fixed by #459
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@kris-brown
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kris-brown commented Jul 7, 2021 •
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A natural construction to make is the product of morphisms f:A->B and g:C->D, obtaining f x g: A x C -> B x D. This can be done by using proj1 and proj2 on the product of the domains, composing these with f and g respectively, then finally using the pair function.
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kris-brown commented Jul 8, 2021 •
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(also TODO: sum of morphisms)

@epatters epatters changed the title product of morphisms Products and sums of morphisms in FinSet Jul 8, 2021
@epatters epatters mentioned this issue Jul 10, 2021
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(Co)cartesian category instances from (co)products epatters/Catlab.jl
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