*Theorema Egregium* – rank theorem

__Egregious__ and __rank__ both (can)
mean **conspicuously bad**, as in *egregious*
behavior and *rank* treachery.

However the
etymology of __egregious__ shows that it originally meant **conspicuously
good**! It is this original meaning
Gauss intended when he named his result the *Theorema
Egregium*.

A final
note: The “rank theorem” is more
commonly (but not exclusively) known as the “rank nullity theorem”.

Etymology
Sources: (search on *egregious*)

http://wordsmith.org/awad/index.html

http://en.wikipedia.org/wiki/Theorema_Egregium

http://mathworld.wolfram.com/GausssTheoremaEgregium.html

http://en.wikipedia.org/wiki/Rank-nullity_theorem

http://mathworld.wolfram.com/Rank-NullityTheorem.html

http://en.wikipedia.org/wiki/Rank_%28linear_algebra%29