Κυριακή 11 Αυγούστου 2013


Postcard sent in 1897 from Salonica, Greece, then Ottoman Empire.

The text is cryptographed (encrypted)

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CYCLOLOGIC

Let ABC be a triangle Denote 1. Oa, Ob, Oc = the circumcenters of HBC, HCA, HAB, resp. ABC, OaObOc are cyclologic, since Oa, Ob, Oc...