Further Questions about Tetrads

by Walter Trump

1. What is a Tetrad?

2. What is the intention of this website?

3. Who published the first Tetrads?

4. Was the problem already known before 1975?

5. Is it easy to find a tetrad with hole?

6. Can a schoolkid find a tetrad with no hole?

7. What is the benefit of polyomino tetrads?

8. Why was the order-11 polyomino tetrad not found earlier?

9. Which tetrads are shown in Gardner's book?

10. Can the outline of a Tetrad form a regular polygon?

11. Can two tiles of a Tetrad form a regular polygon?

12. What about circles and tetrads?

13. Can four quadrilaterals form a tetrad?

14. Can four pentagons form a tetrad?

15. Which tetrads can be made with hexagons?

16. Are there tetrads with no common vertices?

17. Can two tiles surround the others? New 2020-02-20

Planned: Are convex tiles possible?

Planned: Are convex tetrads possible?

Planned: What about symmetric tiles?

Planned: Which symmetric tetrads are there?

References - Where can I read more about tetrads?

Comments - What do experts say?