A binary cover with a trivial second fundamental group: local context

Project map · Chapter map · Full theorem DAG · Open textbook statement

This local map shows one dependency hop in either direction. The highlighted item is the current focus. What the colours mean

fully proved3Proved, and every prerequisite is fully proved too.

graph LR n0["Binary van Kampen is a group pushout"]:::fully_proved n1["A binary cover with a trivial second fundamental group"]:::fully_proved n2["Attaching 2-cells adds the attaching relations"]:::fully_proved n0 -.-> n1 n1 --> n2 click n0 "../../../../../roadmap/fundamental-group/van-kampen/index.html#binary-van-kampen-pushout" "Binary van Kampen is a group pushout — 1 item · 1 fully proved" class n1 focus click n1 "../../../../../roadmap/fundamental-group/van-kampen/cell-attachment-support/index.html#binary-cover-trivial-piece-quotient" "A binary cover with a trivial second fundamental group — 1 item · 1 fully proved" click n2 "../../../../../roadmap/fundamental-group/van-kampen/index.html#attach-two-cells-fundamental-group" "Attaching 2-cells adds the attaching relations — 1 item · 1 fully proved"