I'm reading the Wikipedia article on Online Machine Learning and some of the algorithms mentioned there seem to be missing some context: https://en.wikipedia.org/wiki/Online_machine_learning#The_algorithm_and_its_interpretations
Specifically, in the first paragraph of the link above it mentions $H = \{ \langle w, \cdot \rangle : w \in \mathbb{R}^d \}$ and $V( \cdot , \cdot )$.
What do the dots represent in those equations? I assume they're not a simple variable like $x$ or $y$, but it's hard to figure it out.
Thanks!
It's a standard notation to denote parameter positions, so $V$ here has two inputs, and $H$ here is a set of functions each with one input that is passed as the second input to the inner product (with first input being some $w \in \mathbb{R}^d$ .