Abstract
The transition point of the random Ising model on the square lattice is exactly calculated under the assumption of quenched randomness of bond defects. The author makes use of a duality transformation and the replica method. The transition point thus obtained is given by exp(-2Kc)=exp((1-1/2p)ln2)-1 which satisfies the boundary conditions: Tc to 0 as p to pc=1/2; and Kc to 1/2ln( square root 2+1) as p to 1.

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