Planarity found in inducing $K_5$
59780
how to show that when an edge is removed from K5, the resluting subgraph is planar.
110167
A conjecture with connection to the $abc$-conjecture
26790
Proving the geometric sum formula by induction
130751
Lower bound for monochromatic triangles in $K_n$
122151
Proof a $2^n$ by $2^n$ board can be filled using L shaped trominoes and 1 monomino
27407
every planar graph can be expressed as a union of five edge-disjoint forests
27373
Graph Proof by induction.
102422
Irreducibly of $x^5-x-1$ over $\mathbb{F}_3$
68308
A (probably trivial) induction problem: $\sum_2^nk^{-2}\lt1$
66708
Elementary isomorphism between $\operatorname{PSL}(2,5)$ and $A_5$
43845
Partitioning the edges of $K_n$ into $\lfloor \frac n6 \rfloor$ planar subgraphs
70761
Number of ways to connect sets of $k$ dots in a perfect $n$-gon
51465
New, elegant proofs for $\varphi(p^{k})=p^{k}-p^{k-1}$
124467
Can $(X_1,X_2) \cap (X_3,X_4)$ be generated with two elements from $k[X_1,X_2,X_3,X_4]$?
131306
Prove that a group of order $2^5 \cdot 7^5$ is not simple
116538
Proof of Connected Diagrams
101034
What's the probability that a given permutation has exactly $k$ fixed points.