# user7534

less info
reputation
5
bio website location age member for 3 years seen 40 mins ago profile views 5

# 18 Actions

 Nov12 comment Which is larger? $20!$ or $2^{40}$? Guys, I think the point is that anyone could have plugged these numbers into their calculator in a second. Posters who ask questions like these usually have the implicit assumption that they want to prove it elegantly without explicit computation - for novelty purposes. Oct14 comment How can I better understand manipulating “operators” in mathematical relations? Thanks. Okay, I understand that you can do this algebra of functions, but if I just have some operator or map $A : U \rightarrow V$ and I have an element $u \in U$, then when I write $Au$ I mean the result of applying operator $A$ with input $u$? Is writing the operator next to a member of its input type "implied application"? Oct14 asked How can I better understand manipulating “operators” in mathematical relations? Jul8 accepted What “is” a matrix in the context of a vector space? Jul8 comment What “is” a matrix in the context of a vector space? I think I understand. Since the space of ALL possible linear maps from V to W is isomorphic with the set of ALL m x n matrices, we can work with matrices and perform arithmetic on them and interpret our results in terms of linear mappings because of the isomorphism. So would it be reasonable then to view the "multiplication" of a vector by a matrix just an expression of the matrix's corresponsing map being applied to the vector? I think I'm splitting hairs at this point but I do feel more comfortable thanks to your post. Jul8 asked What “is” a matrix in the context of a vector space? May31 comment Two questions about Euler's number $e$ If I may recommend a book, check out "e: The story of a number" by Eli Maor. It's an excellent read that talks all about the history of the number e and all of its implications. You can find it here (or of course look for it at a library at school or otherwise): amazon.com/Story-Number-Princeton-Science-Library/dp/0691141347 May16 comment Are these 2 graphs isomorphic? I would be interested in seeing the code, if you don't mind. Apr23 awarded Critic Aug22 asked What are the technical reasons that we must define vectors as “arrows” and carefully distinguish them from a point? Mar28 awarded Scholar Mar28 accepted Notation for factorial-type pattern with a skip/step of two instead of one? Mar28 awarded Supporter Mar28 comment Notation for factorial-type pattern with a skip/step of two instead of one? Well... that is indeed what I was looking for. Didn't know that notation existed! Mar28 awarded Student Mar28 awarded Editor Mar28 revised Notation for factorial-type pattern with a skip/step of two instead of one? added 146 characters in body Mar28 asked Notation for factorial-type pattern with a skip/step of two instead of one?