Roots Of Unity Proof On Concurrent Lines
31340
Concurrent lines proof for a regular 18-gon
85713
Showing Parallelism is an equivalence relation in $\Bbb R ^2$
152685
Parallel postulate from Playfair's axiom
13136
Element chasing proof that $(A\setminus C)\setminus(B\setminus C) = (A\setminus B)\setminus C$
157939
prove that a graph is one-ended
62484
Proving Hartshorne's Exercise I-1.9 by using exercise I-1.8
106799
Proof Verification: Converse of Intermediate Value Theorem
106011
Proving it has all real roots
46469
$n$ Lines in the Plane
141101
Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured
79808
Prove the representation of complex numbers is parallelogram
119889
Pile splitting problem (Proof by induction)
146984
Prove: Full Rank and a solution os linear system
103463
Mantel's Theorem proof verification
90273
Primitive roots of the unity in $\mathbb C$
65276
Residues and poles proof
7891
Sum of nth roots of unity