[He sighs a little. She's really not going to get over the blood redirection thing, is she? At least he's fairly sure he doesn't need to explain what a vector is to her.]

Essentially. Where I'm from, espers are people who've become disassociated from normal reality and replace it with their own Personal Reality. By doing the right equations, I can forcibly influence normal reality using my Personal Reality, by way of quantum mechanics.