# List of proofs of non-trivial theorems which were unnoticed to be wrong for at least a few years

For example, the Weber's proof of Kronecker–Weber theorem. I would like to know such proofs. It seems to be important for me to remember that a widely accepted proof might be wrong.

• Can we ask that answers in mathoverflow.net/questions/879 not be repeated here? (Unfortunately, that probably won't work.) – GEdgar Aug 11 '13 at 1:24
• I. R. Shafarevich, Construction of fields of algebraic numbers with given solvable Galois group (1954) math.stackexchange.com/questions/25242/… – Makoto Kato Aug 11 '13 at 3:47
• Pontryagin proved that $\pi_{n+2}(\mathbb{S}^n) = 0$ in 1938. However, he and G.W. Whiteheand corrected it in 1950 independently. – Makoto Kato Aug 11 '13 at 3:48