The quality of being unable to be exchanged or interchanged.

अपरिवर्तनीयता

English Usage: Incommutability of the two systems implies they cannot be transformed into one another.

Hindi Usage: दो प्रणालियों की अपरिवर्तनीयता का अर्थ है कि उन्हें एक-दूसरे में परिवर्तित नहीं किया जा सकता।