[depletedgherkin]

I also wonder what widely accepted mathematical conjectures were later proven to be wrong (for example, a hypothetical answer would be if it was proved that P = NP, since most computer scientists today believe that P =/= NP).

[daynthelife]

Analytic number theory has seen a fair number of such conjectures. The first that comes to mind is the Pólya conjecture [0]. The conjecture stated that for any positive integer N > 2, there are at least as many positive integers less than N with an odd number of prime factors as there are with an even number. The smallest counterexample is N = 906,150,258. [0] https://en.m.wikipedia.org/wiki/P%C3%B3lya_conjecture