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  @dmm symbolic operators: i.e. "p" (or "s" if you will)) "Treatises describing the application of operator methods to ordinary and partial differential equations were written by Robert Bell Carmichael in 1855[3] and by Boole in 1859.[4] This technique was fully developed by the physicist Oliver Heaviside in 1893, in connection with his work in telegraphy. Guided greatly by intuition and his wealth of knowledge on the physics behind his circuit stud...

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  @dmm If you're interested, I believe I have some Heaviside documentation around, from a discussion with John Baez.

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  @paulmasson @christianp We rented a shore house in Maine and it had the crossbeams for the roof exposed. We had a cat that walked them and slept on them; or stared down at us groundlings :)

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  The quote below pretty well sums up American Politics (R side), these days :( I really wish I could find a funny sarcastic quip in my mind; but I can't. The dead and suffering people in Ukraine keep encrouching. Does anybody imagine 45 people will keep a secret. The Russians have that right, something like; if three people know something then it's not a "secret". (I wish I could find a reference) "Pratt, the ABC report alleged, went on to sha...