I have to say that my mind was blown by a book this weekend.

[caraher]

10. It's not unusual for "named" equations to take forms alien to the honoree

Fun things I learned in the three hours of reading. Boltzmann never wrote down the equation now inscribed on his tombstone S = k ln(W).

In a similar vein, Maxwell never wrote the equations of electromagnetism in the forms we know today (I believe Heaviside is credited with the modern notation). This causes some textbook authors to argue for calling them "the Maxwell equations" rather than the more common "Maxwell's Equations" on the basis that the former honors Maxwell's work without implying that the exact equations we use today were "his" equations.

I'm OK with either, personally, but the evolution of notation is fascinating (not to mention the way Maxwell arrived at them, which is very different from the reasoning used to derive/justify them in modern expositions).