Proof using pidgeon-hole principle
60309
Let X be a subset of {1,2,...,2014}...
141496
Could someone make the proof into a hinted exercise?
27086
proof for $\langle q| p \rangle = e^{ipq}$
83596
A simple proof that a polygon circumscribing a circle overestimates its perimeter
94958
Prob. 6 (d), Chap. 1, in Baby Rudin, 3rd ed: How to complete this proof?
150385
The use of the Axiom of Choice in this proof of the sequence lemma
35236
Proof $p \vdash q \Rightarrow p$
86193
Rigorous proof that $dx dy=r\ dr\ d\theta$
45323
How to prove $\vdash\neg P\to (P\to Q)$?
42744
Prove a number is even using the Pigeonhole Principle
123478
Generalized Poincaré Inequality on H1 proof.
105768
Proof involving absolute value and maximums
98372
Proof of the principle of backwards induction
133884
A proof using Yoneda lemma
79727
Direct proof of non-flatness
20750
Proving an equality regarding fully independent events
61810
An application of Borel-Caratheodory theorem