Full Idea
Rescher complains that if coherence requires mutual entailment, then what is entailed is logically redundant, and the whole system is infected with mutual redundancy.
Gist of Idea
Rescher says that if coherence requires mutual entailment, this leads to massive logical redundancy
Source
Jonathan Dancy (Intro to Contemporary Epistemology [1985], 8.1)
Book Reference
Dancy,Jonathan: 'Introduction to Contemporary Epistemology' [Blackwell 1985], p.112