I previously mentioned that my students did much better on – proofs than I expected. So I asked them how they came to know how to do them in a clicker question. Here were their options:

- Calculus
- Foundations (our introduction to proofs course)
- This class (complex analysis); I figured it out while preparing the presentations.
- This class (complex analysis); another student taught me and now I understand.
- This class (complex analysis), but I don’t understand them. I basically just did what another student told me to do.
- You must be mistaken, Bret. I do not know how to do $\delta$-$\epsilon$ proofs.
- Other

About 29% said they learned in our introduction to proofs course, maybe 42% said “Other,” which was a combination of “real analysis” and “the internet,” and the remaining was evenly spread over the other options.

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