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- W3155809743 abstract "The smallest open case for classifying Steiner triple systems is order 21. A Steiner triple system of order 21, an STS(21), can have subsystems of orders 7 and 9, and it is known that there are 12,661,527,336 isomorphism classes of STS(21)s with sub-STS(9)s. The classification of STS(21)s with subsystems is here completed by settling the case of STS(21)s with sub-STS(7)s; there are 116,635,963,205,551 isomorphism classes of such systems. An estimation of the number of isomorphism classes of STS(21)s is given." @default.
- W3155809743 created "2021-04-26" @default.
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- W3155809743 date "2021-04-14" @default.
- W3155809743 modified "2023-09-25" @default.
- W3155809743 title "Steiner Triple Systems of Order 21 with Subsystems" @default.
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