Examples of conjectures that were widely believed to be true but turned out to be false
29142
Examples of patterns that eventually fail
89851
Has any previously unknown result been proven by an automated theorem prover?
83778
An incorrect proof by exhaustion
116283
How to properly interpret a seemingly contradictory result in Mathematica?
67238
Requesting review of technically inaccurate answers
94430
Examples of number theory showing up in physics
47359
Could 'cogito ergo sum' possibly be false?
57280
Unintentional Lies and Misinformation
75600
Is Gödel's modified liar an illogical statement?
103154
Is there a *simple* example of how the axiom of choice can lead to a counterintuitive result?
134517
Is following contradictory? Can you give an example?
126507
Most interesting statistical paradoxes
43348
What is wrong with Popper's theory of falsification?
43224
What experiment would disprove string theory?
74875
Do we know if there exist true mathematical statements that can not be proven?
127642
Is "incorrect facts" a contradiction in terms?
151073
What to do with a question that was based on a wrong assumptions?