Can anyone teach me the means of the following?
$$ f(t,x,v) \in C(\mathbb{R}_+; \mathcal{D}'(\mathbb{R}^n_x \times \mathbb{R}^n_v)).$$
where $\mathcal{D}'(\mathbb{R}^n_x \times \mathbb{R}^n_v)$ is the space of distributions on $\mathbb{R}^n_x \times \mathbb{R}^n_v$. Thank you in advance!