If you’ve had the classic engineering education, you probably have a hazy recollection of someone talking about control theory. If you haven’t, you’ve probably at least heard of P… ...

Leonard Segel, RESEARCH IN THE FUNDAMENTALS OF AUTOMOBILE CONTROL AND STABILITY, SAE Transactions, Vol. 65 (1957), pp. 527-540 ...

However, control theory shows up in a surprising number of places from filters to oscillators, to the automatic gain control in a receiver.