This book is about тАЬdeltaтАЭ, a paradox logic. In delta, a statement can be true yet false; an intermediate state, midway between being and non-being. Delta's imaginary value solves many paradoxes unsolvable in two-valued Boolean logic, including Russell's, Cantor's, Berry's and Zeno's.Delta has three parts: тАЬinner delta logicтАЭ, covering тАЬKleenean logicтАЭ, which resolves self-reference; outer delta logic, covering Z mod 3, conjugate logics, cyclic distribution, and the voter's paradox; and тАЬbeyond delta logicтАЭ, covering four-valued logic and games.