I think that this is the first reference to eigenanalysis in a widely-read comic strip.

Given how often LL flames against writers who engage in baseless linguistic speculation, you'd better have the evidence to back that up.

]]>BTW, always liked *latent root*. Not sure it translates into German.

My point about the French liking their valeurs propres was having a little joke on them when teaching my class about eigenvalues.

]]>Eigenvalues are of course important in quantum mechanics, where an eigenvalue generalizes the value of a function, and where the corresponding eigenvector is the state that the "wavefunction" is in when the function has that value. ]]>

* a *proper subset* of a set *X* is a subset other than the trivial case of *X* itself;

* a *proper divisor* of a number *n* is a divisor other than *n* itself (1 might also be excluded)

(Somewhat similarly, a *strict* inequality "<" excludes the possibility of equality, while ≤ does not and is not "strict")

Because of this established usage, it would not be a good idea to overload *proper* to refer to eigenvalues and eigenvectors.

It was meant as a suggestion. ]]>