On complex numbers as pairs of real numbers and two-dimensional real vectors.

A close encounter with a cousin of the determinant.

A very short note on two particular Chebyshev expansions.

Exhaustive fun with the Cayley-Dickson construction.

Generalizing the commutator and anticommutator of two 2-arrays to 3-arrays.

A proposal for a generalization of the matrix product to 3-arrays.

A puzzle involving tesseract and pentatope numbers.

I learn the difference between a cross-ratio (a projective invariant) and a conformal ratio (a conformal invariant).

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