23rd March

On this day in 1881, J J Sylvester wrote to Arthur Cayley to announce,
I believe that I have proved Gordan's Theorem, and can assign a superior limit to the number of fundamental invariants.
His proof was founded on the prospect that a certain sequence increased without bound. By October he knew that it did not.

On this day in 2015 Google released an Emmy Noether doodle.