Maximally reduce (+ 0 x) and (+ x 0). Is there a difference?
7 March
Let = be Eq_A (slide 2 of DTUA.pdf). Try to prove the groupoid laws on slide 9 of DTUA.pdf (not all are provable, which shows that Leibniz equality is too weak to give types groupoid structure).
Same task as previous, but now with Eq_A from slide 8 of DTUA.pdf (now they are all provable).
Read the Introduction of the HoTT book.
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Marc Bezem?.
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