## Division by Zero

Division by Zero offers articles on math, technology, teaching, and puzzles for the reader. There's some really interesting content on this site.

### Featured Posts

#### Good activity for an Introduction to Proofs class

I just read this post at Futility Closet. (Spoiler: Don’t click the link unless you want to know the punchline.) Perhaps the result is well known, but I hadn’t seen it before. The post made me think of a neat project for an “Introduction to proofs” class. I’ll have to save it for the next […]

#### Editing a Very Poorly Written Proof

I’m teaching Discrete Math this semester. Discrete Math is our college’s “introduction to proofs” class. We spend a lot of time talking about and practicing proofwriting. In earlier blog posts I shared my “Nuts and Bolts of Writing Mathematics” and an “editing checklist” that I give to them. Yesterday, I gave them an example of […]

#### Tangent lines to the sine function with rational slope

Today I was wondering the following thing (I won’t bore you with how I ended up with this question): Are there any rational values of for which the line is tangent to the graph of Clearly the answer is yes: But my gut feeling was that this was the only such After some head scratching, […]

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- Mar 26, 2014 Gabrielâ€™s paper horn
- Feb 18, 2014 Undergraduate Math Bloggers