Comments (2)
favonia
commented on August 28, 2024
This is exactly how I formalized the proof in Agda. Yes, you want a separate constructor (in terms of type theory) for n=0.
from book.
mikeshulman
commented on August 28, 2024
Oh man, you confused me into not looking at this by blaming Dan L for it. I'm the one who wrote the van Kampen section. Yeah, that's more correct. I kind of feel like it should be possible to define things so that n=0 isn't a special case, but maybe that doesn't work with the way you Agda'ed it.
from book.
Related Issues (20)
- Rules for universes in Appendix A.2 are incomplete HOT 3
- identity type usage HOT 19
- Augment assumptions for Thm 5.4.4, 5.4.5, and 5.4.7 HOT 19
- Typos in proof of Lemma 10.3.12 HOT 5
- Use parentheses in the proof of Lemma 2.1.4(iii) HOT 3
- Cumulativity of the universe hierarchy HOT 4
- CI problem: "dubious ownership" HOT 1
- Provided Hashes in errata.pdf Not Found HOT 2
- Errata PDF unreadable
- Corollary 8.8.5 HOT 4
- Lemma 8.5.9 is missing a label
- Nightly builds pdfs are dead links HOT 8
- Exercise 7.3 could be made stronger
- Indexing of maps in fiber and exact sequences HOT 3
- proof-theoretic consistency in the introduction HOT 6
- cardinal numbers in the introduction HOT 5
- real numbers in the introduction HOT 7
- Switch to using truncated logic as default in the book HOT 2
- max and sup HOT 9
- Exercise 11.6 seems to need WLPO not LPO HOT 3
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from book.