Geometry/ Sequence contradiction problem!
2786
The staircase paradox, or why $\pi\ne4$
143424
Sequence problem involving inequalities
81975
Sequence of triangles with exponentiated sides
141101
Russia (2000) contest:Prove the existence of a pair of rows and columns with intersections differently coloured
44399
Arithmetic and geometric sequences: where does their name come from?
101804
Problem concerning the use of Pigeonhole (Box) principle
38004
Constructing the reciprocal of a segment
70460
How can I solve the following sequence
102192
Can someone explain geometric multiplicity?
106643
problem using identity theorem
65168
Proof of sequence inequality
126944
Metric spaces problem
1508
How do I prove that a definition of an ordered pair does not satisfy the required property?
129693
An interesting problem with "decomposing" natural numbers.
128843
Rolle's Theorem Contradiction
151326
Concurrency of the heights of a tetrahedron with opposite edges perpendicular.
11998
In how many sequences of length $n$, the difference between every 2 adjacent elements is $1$ or $-1$?