In this case the terminology is by way of, roughly speaking type theory <- domai... | Hacker News

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hhmc on Jan 21, 2019 | parent | context | favorite | on: Covariance and contravariance in C++

In this case the terminology is by way of, roughly speaking

   type theory <- domain theory <- category theory

Perhaps one can draw a link from the latter to the operators in electromagnetism.

ramshorns on Jan 21, 2019 [–]

Cool. It looks like the one place I'd seen these terms used is a subcategory of one of a few different but related uses.

https://en.wikipedia.org/wiki/Covariance_and_contravariance

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