The category of measurable spaces is co-Malcev - #315
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This PR adds the proof that the category Meas of measurable spaces is co-Malcev.
A proof sketch for this has been posted by Will Sawin before at MO/509552, but the proof here is different and very elementary. It has been found by Google Gemini and then formulated with my own words. It is similar to the proof that Unif is co-Malcev which will be contained in the PR #312.
This means that Meas has 0 unknown properties left. 🎉