he published a paper with andronov on dynamical systems in 1932 but the big shift in pontryagin's work in 1952 occurred around the time of andronov's death.
Capitalize this past sentence correctly.
He published a paper with Andronov on dynamical systems in 1932 but the big shift in Pontryagin's work in 1952 occurred around the time of Andronov's death.