A review of this proof published in Mathematical Reviews claims that Obi's proof is a previously-known false proof.[wiki] Fermat’s Last Theorem had already been solved in 1994 by Andrew Wiles and Richard Taylor.
The review below, of Chike Obi's 10 page solution to Fermat's Last Theorem, was printed in Mathematical Reviews
This is a naive attempt to prove Fermat's last theorem using techniques known only in Fermat's days. This time the error is on the bottom of page 292. The author states
that some numbers, having nothing to do with the equation, satisfy $a\sb 0\sp 2+b\sb 0\sp 2=c\sb 0\sp 2$. The conclusion is that a certain case of Fermat's last theorem is
solved. Using this technique one could prove any conjecture made in mathematics.
Reviewed by F. Beukers