Comment by Turing_Machine

Yeah, all of those seem to be readily available, at least on the US Mac keyboard layout.

ƒ is ⌥f, « and » are ⌥\ and ⌥| respectively, ≤ is ⌥<, ≥ is ⌥>, and ≈ is ⌥x.

Edit: for non-Mac people, ⌥ is the "Option" key. Option+f gives you ƒ, and so on.

> ∧ and ∨

Well, you could always add them to Favorites on the "Emoji and Symbols" popup.