INVARI
A
NTS
An algebraic topology quiz. A space appears — read off the invariant before the chalk runs out.
▸
π₁, Hₙ, χ, homotopy type — pick 1 of 4.
▸
Faster answers score more (except in zen mode).
▸
Three punctures
●●●→○○○
and you're out.
Dark
Light
Quiz
Thesis
Knots
Time per question
20s
5s
∞ zen
Start
Best run:
—
conventions: integral coefficients · ℤ/n = ℤ/nℤ · Fₖ = free group
⌂
score ·
×1
0
question 1
∂ ↛ 0
The sequence didn't close.
Score
0
Correct
0
Best streak
0
Best run:
—
Play again
menu
typeset with KaTeX · questions in questions.js · MIT