Risk and Statistics

The risks associated with medicines and medical procedures are rarely conveyed clearly. I remember learning about intra-uterine devices in high school health class and the fact that uterine puncture was a risk with them, which sounds awful and terrifying. However, there are two vital pieces of information omitted in that statement: first, how high is […]

Applying Linearity

At the center of almost any proof involving linear transformations is to apply linearity to move between the domain and codomain, preserving the structure of linear combinations. Statements proved in such a way: all linear transformations take 0 to 0 images of subspaces are subspaces (special example: image) preimages of subspaces are subspaces (special example: […]

Musings on Limits

In case it wasn’t clear from musings on series, these posts are collections of themed material that individually don’t make full posts. 1. There are many ways for a limit to fail to exist. It could be infinite, oscillate within a finite interval, completely devolve into radio static, or simply give you different values when […]

Graphing Utility Recommendation

Here at the start of another string of posts I wanted to recommend a graphing program I’ve used pretty intensively recently: Graphmatica. It’s shareware with a license fee of $25, and in particular if you want to graph complicated piecewise-defined functions it’s the best thing around. The graph below was entered as a single function. […]

Mathlinks: Statistics Edition

I had enough links from teaching statistics to make their own list. Actually several lists. Textbooks and other comprehensive approaches Online Statistics Education, an online openly licensed statistics text with labs; outgrowth of the Rice Virtual Lab in Statistics StatLib, a statistics community database The Little Handout of Statistical Practice, online textbook Sources for statistics […]

Mathlinks

I had a page on my Notre Dame website called mathlinks. This isn’t the same collection but it falls into the same category. The math genealogy page is always interesting reading. A translation of Euclid’s Elements by Richard Fitzpatrick. The University of Michigan’s Historical Mathematics Collection. A page of famous codes and ciphers. Animated GIF […]