Reusable memories in the light of the old arbitrarily varying-and a new outputwise varying channel theory

· 'Abstract-"-Arbitrarily. varying ·(AV) . channels were introduced a,s a 111od~l ,for tra._s111ission. in .cases •. of. jamming. It is shown tllat th!!ir th~ry ap~lies naturally to 111e01ories and yields, in a unified way,'some . new and •qid ciiP,a~ity theol"(lms for write-· tiliidirectional (and 'more general) 'memories With side information: If the encOder has no si~e information, if iir still' not understoOd what the optimal rates 'for:many cycles are. More insight through a theory of outputwise varying (OV) channels is expected.