In looking over what I *want* my deadlines to be, and what the calendar looks like, I learn I should also be asking for topics that start with the letters B and C … yesterday, really. Today is probably close enough. And I am still interested in letter-A topics.

It all remains straightforward. Please comment with some mathematical topic, with a name that starts ‘B’ or ‘C’, that you’d like to see me try to write about. This can include people, too. I’m not likely to add to the depth of people’s biographical understandings. But I can share what I know, or have learned. Please also let me know how to credit you for a topic, and any project you’re working on that I can give some attention to.

I’m not afraid of re-visiting a topic, if I think I can improve it. But topics I have already covered, starting with the letter B, are:

**Bijection**(2015)**Basis**(Leap Day 2016)**Boundary value problems**(End 2016)**Benford’s Law**(2017)**Box-and-whisker plot**(2018)**Buffon’s needle**(2019)

And here are topics I’ve written about for the letter C before:

**Characteristic**(2015)**Conjecture**(Leap Day 2016)**Cantor’s middle third**(End 2016)**Cohomology**(2017)**Commutative**(2018)**Category theory**(2019)

My actual deadline will remain “about three minutes before publication”.

Suggestions for B:

– Bolzano–Weierstrass theorem

– Bourbaki

– boundedness theorem

Suggestions for C:

– Complex Numbers

– Continuous functions

– computational complexity

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Thank you again; they’re a good set of topics.

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Bourbaki and complex are great ideas.

B: ball, billiards, bisect/or,

C: circle, coordinate, Cartesian, calculus, co- (what it means in math), cover

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Thanks again and, oh, now, co- is really catching my fancy, although I’ll have to think more about whether I can write well about it.

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Perhaps I shouldn’t over-contribute, but here are a few B’s and C’s that might make fruitful writing and fun reading…

Balanced Ternary

Bell’s Theorem

Busy Beaver

Borromean Rings

Butterfly Effect

Catalan Numbers

Chip-firing Games

Cross-ratio

Curvature

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No, no, please don’t ever fear over-contributing. Each fresh idea is great. Even if I don’t know how to use one, it helps me find a stronger idea.

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