I have a fever, so posting from me will be light. Before I go back to my sick-bed, though, I wanted to draw your attention to this web site that documents bias in Wikipedia. Most of the examples listed are not math-related, but item number 16 is:

Wikipedia has many entries on mathematical concepts, but lacks any entry on the basic concept of an elementary proof. Elementary proofs require a rigor lacking in many mathematical claims promoted on Wikipedia.

Further perusing of the site reveals that they mean elementary proofs in number theory, i.e. proofs don’t use complex analysis. Apparently belief in the complex numbers is a form of bias.

Via Good Math, Bad Math.