A reader asked me about matrices, so I referred him to my series of Tutorials on Matrices and IR. He then asked me about some special kind of matrices. I answered his questions with some examples. He then replied with some analogies.
Here is what I answered and his analogies (sort of). I guess he must be a graduate student on something.
1. Toeplitz Matrix (no, that isn’t Topless)
This is a matrix where all elements on superdiagonals and subdiagonals are equal.
2. Hankel Matrix (no, that isn’t Hanky-Panky)
This is a matrix where all elements on any superdiagonal and subdiagonal perpendicular to the main diagonal are equal.
3. Vandermonde Matrix (no, that isn’t Banned on Monday)
A matrix where first column is 1’s succesive columns being the second column with its elements raised to increasing integer powers.
4. Idempotent Matrix (no, that isn’t impotence).
A matrix that when raised to an integer power remains the same.
Topless and Hanky-Panky banned on Monday due to impotence?