A great exposition (as always) of Unitary Matrices by Nebus Research Blog.

I assume that last week I disappointed Mr Wu, of the Singapore Maths Tuition blog, last week when I passed on a topic he suggested to unintentionally rewrite a good enough essay. I hope to make it up this week with a piece of linear algebra.

Art by Thomas K Dye, creator of the web comics **Projection Edge**, **Newshounds**, **Infinity Refugees**, and **Something Happens**. He’s on Twitter as @projectionedge. You can get to read **Projection Edge** six months early by subscribing to his Patreon.

# Unitary Matrix.

A Unitary Matrix — note the article; there is not a singular *the* Unitary Matrix — starts with a matrix. This is an ordered collection of scalars. The scalars we call elements. I can’t think of a time I ever saw a matrix represented except as a rectangular grid of elements, or as a capital letter for the name…

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