Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on Getting started with linear algebra. Parent comment
<Ax, y> = <x, By>
where <,> is some inner product, and you say that the the linear transformation A is adjoint to B. If you take the usual inner product, then A is B^T.
A previous conversation: https://news.ycombinator.com/item?id=15948153
As for 2, norms (and general inner products) show up in more theoretical parts of math that use linear algebra. Maybe an applications-focused treatment doesn't need to focus so much on it?
There are no comments on this comment yet.
<Ax, y> = <x, By>
where <,> is some inner product, and you say that the the linear transformation A is adjoint to B. If you take the usual inner product, then A is B^T.
A previous conversation: https://news.ycombinator.com/item?id=15948153
As for 2, norms (and general inner products) show up in more theoretical parts of math that use linear algebra. Maybe an applications-focused treatment doesn't need to focus so much on it?