homomorphism
| Title | Source | Status | Imp. | Posted |
|---|---|---|---|---|
| Sidorenko's Conjecture | opg | partial | ★★★ | 2019-10-10 |
| Hedetniemi's Conjecture | opg | disproved | ★★★ | 2008-05-25 |
| Mapping planar graphs to odd cycles | opg | partial | ★★★ | 2007-06-24 |
| Pentagon problem | opg | open | ★★★ | 2007-03-24 |
| Algorithm for graph homomorphisms | opg | partial | ★★ | 2010-07-08 |
| A homomorphism problem for flows | opg | partial | ★★ | 2007-03-07 |
| Weak pentagon problem | opg | partial | ★★ | 2007-07-13 |