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Robert Steinberg, 1922-2014

Galois matrices, the subject of the previous post, are of course not new. See, for instance, Steinberg in 1951: The American Mathematical Society reports that Steinberg died on…

Galois Matrices

The webpage Galois.us, on Galois matrices , has been created as a starting point for remarks on the algebra  (as opposed to the geometry) underlying the rings of matrices mentioned in…

Black Key

The title was suggested by a post on The Piano and by the dimensions of an image in this morning’s previous post:  404 x 211 pixels, suggesting 4/04,…

From a Soundtrack:

Jungle music suggested by yesterday’s Black Widow Club post, by the midnight post that followed, and by a May 24 death:

Angel in the Wings

Or: Corrections Factually Incorrect: Ed Koch in the Las Vegas Sun , May 26, 2014: “In addition to Pearl, Bob’s other cousin, Bill Bailey, was a song and dance…

For the Black Widow Club*

… and for Anthony Hopkins and a Black Widow, as well as for a filmmaker who reportedly died on May 19. Update of 4:48 PM ET:  See also Philip Roth on an ambiguity. *…

Quaternion Group Models:

The ninefold square, the eightfold cube, and monkeys. For posts on the models above, see quaternion in this journal. For the monkeys, see "Nothing Is More Fun than…

Combinatorial Matrix Classes

A book by this title, Richard A. Brualdi’s  Combinatorial Matrix Classes , was published by Cambridge University Press in 2006: For some related remarks, see The Counter (March…

Matching Theory

Some mathematical background for yesterday’s remarks “For the Bregnans” and “Lost in Translation“— “Matching Theory: A Sampler, from Dénes König to the Present,” by Michael D. Plummer, 1991….

Lost in Translation

Translation by Barbara Johnson: "The minimum number of rows— lines or columns— that contain all the zeros in a matrix is equal to the maximum number of zeros located in…