Topology 101(do not erase — really)
∀ ε > 0 ∃ δ > 0 :
|x − a| < δ ⇒ |f(x) − f(a)| < ε
⇒ f continuous at a.  ∎
∴ the limit exists. probably.
eiπ + 1 = 0
TODO: finish for next week (chalk dust, mostly erased)
Office Hours: Tue 2–4 (nobody comes)
π = 3.14159265358979…
(ran out of board)
b a c a² + b² = c²
∑ 1/n² = π²/6
(Basel, 1734)
∫ e−x² dx = √π
No errors. Goals accomplished.
0 sorries · 1 mathematician, lightly obsolete
R . I . P

Pure Mathematics

c. 300 BC – 2026
“∎ (Someone else’s, technically.)”

Survived by

  • The two-column proof, who always tried its best
  • A blackboard eraser, mostly chalk dust now
  • Proof by intimidation, retired undefeated
  • The back of an envelope
  • sorry, used honestly for the first time
  • Office hours, Tuesdays 2–4pm, mostly empty
  • One open conjecture, kept for sentimental reasons
In lieu of flowers, please submit a pull request.