https://ptolemy.berkeley.edu/eecs20/week9/timeinvariance.html#:~:text=A%20time%2Dinvariant%20system%20is,invariance%20is%20a%20mathematical%20fiction https://pt

https://ptolemy.berkeley.edu/eecs20/week9/timeinvariance.html#:~:text=A%20time%2Dinvariant%20system%20is,invariance%20is%20a%20mathematical%20fiction https://ptolemy.berkeley.edu/eecs20/week9/timeinvariance.htm.... Time invariance is mathematical fiction. Haha. What a wonderful quote.