It is usual to have tensors in general relativity with discret index in the integer numbers. I propose to have index in the real numbers so that we can have for example:
˜At=∫+∞−∞At′(∂˜xt∂xt′)dt′
The differential of a function is:
df=∫+∞−∞∂f∂xtdxtdt
We have also:
∫+∞−∞(∂˜xt∂xt′)(∂xt′∂˜xt″)dt′=δ(t−t″)
The sums are replaced by integrals. The points of the manifold are replaced by smooth functions. The coordinates are:
xt(f)=f(t)
Can we make Einstein general relativity with continuous tensor calculus?