[InsideOutSanta]

Iirc, Heisenberg reinvented Matrix calculations to solve a problem in quantum physics. Not being a mathematician, he wasn't aware of the concept. Born recognized what Heisenberg had done and introduced him to his own reinvention.

[geon]

PBS Space Time released a video with that story yesterday: https://www.youtube.com/watch?v=c-Q5r3THR3M