Just a bit of uninvited curmudgeon commentary:
I know this is just meant to be cute, not really meaningful -- sadly, girly-cute shirts beat out actually-clever shirts way too often, bringing into doubt the big change in 1919 -- but Schroedinger's Cat refers not to any equation he wrote, but illustrates his, and Einstein's, opposition to Heisenberg's junk science.
See, Heisenberg was using unscientific methodology to justify an unsound set of shortcuts in physics, and Schroedinger was using the cat example to explain how nonsensical it was. So the actual Schroedinger's Cat equation is Heisenberg's.
The importance of that is so great, and supposed science fans so ignorant of it, that it bears mentioning, here:
Schroedinger, Einstein, Popper, and von Mises were a sort of last bastion of sound scientific method, at a time when bureaucrat-funded junk science was coming to dominate.
Their opponents, the Forces of Darkness, included Heisenberg, Bohr, and the rest of the Copenhagen frauds. While our Brave Heroes advocated Scientific Realism, a strict set of rules for keeping science sound and accurate, the Dark Side preferred the quick hype and easy results of Scientific Instrumentalism, where you play fast and loose with the facts, in order to impress bureaucratic committees into funding your work more easily.
Sadly, the Evil Empire won, which is why we've had the Scientific Consensus run down blind alleys for decades, before realizing that everything we "knew" about some given discipline was actually off-base.
