I’m looking for G, H, and I topics for the All 2020 A-to-Z

When I look at how much I’m not getting ahead of deadline for these essays I’m amazed to think I should be getting topics for as much as five weeks out. Still, I should.

What I’d like is suggestions of things to write about. Any topics that have a name starting with the letters ‘G’, ‘H’, or ‘I’, that might be used for a topic. People with mathematical significance count, too. Please, with any nominations, let me know how to credit you for the topic. Also please mention any projects that you’re working on that could use attention. I try to credit and support people where I can.

These are the topics I’ve covered in past essays. I’m willing to revisit one if I realize I have fresh thoughts about it, too. I haven’t done so yet, but I’ll tell you, I was thinking hard about doing a rewrite on “dual”.

---

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

• Graph (2015)
• Grammar (Leap Day 2016)
• General Covariance (End 2016)
• Gaussian Primes (2017)
• Group Action (2018)
• Green’s Function (2019)

---

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

• Hypersphere (2015)
• Homomorphism (Leap Day 2016)
• Hat (End 2016)
• Height Function (elliptic curves) (2017)
• Hyperbolic Half-Plane (2018)
• Hamiltonian (2019)

---

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

• Into (2015)
• Isomorphism (Leap Day 2016)
• Image (End 2016)
• Integration (2017)
• Infinite Monkey Theorem (2018)
• Infimum (2019)

---

Thank you all for your thoughts, and for reading.