Modulo Subtraction is Well-Defined/Examples/19-6 equiv 11-2 mod 4

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Examples of Use of Modulo Subtraction is Well-Defined

We have:

\(\ds 19\) \(\equiv\) \(\ds 11\) \(\ds \pmod 4\)
\(\ds 6\) \(\equiv\) \(\ds 2\) \(\ds \pmod 4\)
\(\ds \leadsto \ \ \) \(\ds 19 - 6 = 13\) \(\equiv\) \(\ds 11 - 2 = 9\) \(\ds \pmod 4\)


Sources