Abstract
The smallest open case for classifying Steiner triple systems is order 21. A Steiner triple system of order 21, an STS, can have subsystems of orders 7 and 9, and it is known that there are 12,661,527,336 isomorphism classes of STSs with sub-STSs. Here, the classification of STSs with subsystems is completed by settling the case of STSs with sub-STSs. There are 116,635,963,205,551 isomorphism classes of such systems. An estimation of the number of isomorphism classes of STSs is given
| Original language | English |
|---|---|
| Journal | Glasnik Matematicki |
| Volume | 58 |
| Issue number | 1 |
| Publication status | Published - 2023 |
| MoE publication type | A1 Journal article-refereed |