A paper published in the January 2010 issue of Computers & Mathematics with Applications which, according to Times Higher Education, “used unspecified computer ‘magnification technology’ to provide the first proof of a Euclidean axiom called the ‘parallel postulate'”, has been withdrawn by the publisher.

According to Retraction Watch, the abstract for the article claims that

an impossible proposition was proved as possible. This is a problematic problem. Further studies will give birth to a new branch of mathematical science.

And the retraction notice offers apologies to readers and says the article has been retracted

at the request of the Publisher, as the article contains no scientific content and was accepted because of an administrative error.

Sources:
Times Higher Education: Scholar’s paper doesn’t add up.
Retraction Watch: Math paper retracted because it “contains no scientific content”.