noninterchangeable

English Thesaurus

1. such that the terms of an expression cannot be interchanged without changing the meaning (adj.all)

similar	:	asymmetric, asymmetrical,
definition	:	characterized by asymmetry in the spatial arrangement or placement of parts or components (adj.all)

domain category	:	math, mathematics, maths,
definition	:	a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement (noun.cognition)

domain category	:	logic,
definition	:	the branch of philosophy that analyzes inference (noun.cognition)