Thank you both for the directions Nils Bruin, Symbolic variables link
really helped. The following code works;
t,A =var('t','A')
A=function('A',nargs=1)(t);A
A.derivative(t,1)
Is it possible, to display A.derivative(t,1) with a dot notation \dot{A}
instead of \frac{\partial A}{\partial t}?
On
http://doc.sagemath.org/html/en/reference/calculus/sage/calculus/var.html#sage.calculus.var.function
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