# New in *MathWorld* -- May
2018

### Thursday May 24, 2018

- Generalized Quadrangle (modified)
- Kissing Number Problem

### Tuesday May 22, 2018

- Goddard-Henning Graph (modified)

### Thursday May 17, 2018

- Heule Graphs (modified)

### Monday May 14, 2018

- Riemann Zeta Function (modified)

### Tuesday May 8, 2018

- Unit-Distance Graph (modified)

### Monday May 7, 2018

- de Grey Graphs (modified)
- Hadwiger-Nelson Problem (modified)
- Heule Graphs

### Thursday May 3, 2018

- Anarboricity (modified)
- Lefschetz Fixed Point Theorem (modified)
- Zero Product Rule

### Wednesday May 2, 2018

- Matchstick Graph (modified)
- Nested Radical (modified)
- Unit-Distance Graph (modified)

### Tuesday May 1, 2018

- Gear Graph (modified)
- Matchstick Graph (modified)
- Sunlet Graph (modified)
- Unit-Distance Graph (modified)

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