As stated in the title, reading Milnor-Stasheff Characteristic classes, I encountered at page 95 the following sentence:
let $\Delta^n$ be an $n$-simplex, linearly embedded in the $n$-dim vector space $V$ [...]
What is a linear embedding? The fact that $\Delta^n$ is not a vector space stops me from saying that it's a linear map, but I feel this should be the idea. I wasn't able to find anything on internet, so I'm asking here.