Some exciting things have happened recently. Amongst them, it has been proved that combinatorial designs (generalised Steiner systems) exist for all tuples of parameters for which a necessary divisibility criterion is satisfied.
Anyway, the cipher:
Some exciting things have happened recently. Amongst them, it has been proved that combinatorial designs (generalised Steiner systems) exist for all tuples of parameters for which a necessary divisibility criterion is satisfied.
Anyway, the cipher: