Groupprops:Error log/2011

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This is an archive of errors fixed in the year 2011. The criteria for logging an error are that either of these conditions hold:


 * The error was on a highly trafficked page (more than 1000 cumulative pageviews so far) and stayed online for at least 24 hours.
 * The error stayed online for at least a month.

Technical (computer-related) errors

 * For some pages, due to editing from a mobile/NetFront browser, the entire page got truncated to the first 5 KB (roughly 5-6 scroll downs) and the rest of the page went missing. This happened to the quaternion group page: the truncation happened on July 1 and was fixed on July 3. It also happened to the linear representation theory of quaternion group page on July 2, but that was fixed within an hour.

Erroneous pages/statements

 * August 21, 2011: A page titled normal not implies Lagrange-like incorrectly stated that a normal subloop in a finite loop need not be a Lagrange-like subloop, and gave a mistaken example (the example subloop wasn't normal). The correct statement is normal implies Lagrange-like.
 * A page titled non-modular implies character-determining mistakenly stated that if the characteristic of a field does not divide the order of a finite group, then any linear representation over the field is determined by its character. In fact, the statement is true only in characteristic zero, for the silly reason that taking a representation with multiplicity $$p$$ gives a character that takes the value zero everywhere. The correct versions are at character determines representation in characteristic zero and character does not determine representation in any prime characteristic

Factual errors in high traffic pages
These errors are in pages that had received over 1000 cumulative pageviews at the time the error was fixed.