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Had a thought. @scratch is to Python as ??? is to @leanprover Parsons-Haden problems sort of scratch this itch (no pun intended, really), but where's my block-based proof assistant/verifier?
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Yesterday I had the realization that some of my topology students are having issues with applying \exists and \forall appropriately when trying to prove regular+T0 imply T1. Why can't they drag a T1 block to a goal, be given the x,y they need to separate... 2/n
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then drag T0 to get two cases (it guarantees a nbhd U for x OR y, but we need both). Then drag "complement of open is closed" on U to get H, then drag regular into x,H to complete the proof.