Given two differentiable maps between differential manifolds:
$$f : X \to Y, g : X \to Z,$$
Is $f \times g : X \times X \to Y \times Z$ differentiable?
I think yes. And you get $d(f \times g)_{(x,y)} = d(f)_x \times d(g)_y$?
Given two differentiable maps between differential manifolds:
$$f : X \to Y, g : X \to Z,$$
Is $f \times g : X \times X \to Y \times Z$ differentiable?
I think yes. And you get $d(f \times g)_{(x,y)} = d(f)_x \times d(g)_y$?
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