It does seem like I only just began the All 2020 Mathematics A-to-Z and already I need some fresh topics. This is because I really want to get to having articles done a week before publication, and while I’m not there yet, I can imagine getting there.

I’d like your nominations for subjects. Please comment here with some topic, name starting ‘D’, ‘E’, or ‘F’, that I might try writing about. This can include people, too. And also please let me know how to credit you for a topic suggestion, including any projects you’re working on that could do with attention.

These are the topics I’ve covered in past essays. I’m open to revisiting ones that I think I have new ideas about. Thanks all for your ideas.

Topics I’ve already covered, starting with the letter D, are:

**Dual**(2015)**Dedekind Domain**(Leap Day 2016)**Distribution (statistics)**(End 2016)**Diophantine Equations**(2017)**Distribution (probability)**(2018)**Differential Equations**(2019)

Topics I’ve already covered, starting with the letter E, are:

**Error**(2015)**Energy**(Leap Day 2016)**Ergodic**(End 2016)**Elliptic Curves**(2017)**e**(2018)**Encryption Schemes**(2019)

Topics I’ve already covered, starting with the letter F, are:

**Fallacy**(2015)**Fractions (Continued)**(Leap Day 2016)**Fredholm Alternative**(End 2016)**Functor**(2017)**Fermat’s Last Theorem**(2018)**Fourier Series**(2019)

Thank you for reading, and for your thoughts.

Is Fibonacci too common a topic? I personally love the person’s story with arabic numerals.

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None too common a topic, no. Thank you; it’s a great notion.

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Delta (both a letter and in delta epsilon proofs).

Exact value

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Also fun topics to think about, thank you.

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Division, Dirichlet, deduction, dilation, differential geometry, distributivity

Exponential, Euler, Euclid, expected value, exponential

Factorial (might lead into gamma function), Fermat (or his primes or his little theorem or…), formula, fractal

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Great menu of topics, yeah. Thank you.

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I’ll keep it to just a couple this time:

Euclid’s Algorithm (for gcd)

Flexagon

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Good topics, though, thank you!

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