what does this notation mean: $f^{(1,0)}(x,t)$?

Question

For a bivariate function $f(x,t)$, what does this notation mean: $f^{(1,0)}(x,t)$

Answer 1

I don't think that it's a standard notation. Nevertheless one can see in some papers and books the notation : $$\frac{\partial^{n+m}f(x,y)}{\partial^n x\:\partial^m y}\equiv f^{(n,m)}(x,y) $$ which is also used by WolframAlpha.

From the context, this is consistent with : $$ f^{(1,0)}(x,y) \equiv \frac{\partial f(x,y)}{\partial x}$$

Answer 2

I suspect that notation means $f_x (x,t)$ which means the partial derivative of $ f(x,t)$ .