The notation 'a ≡ b (mod n)' means that the integers a and b are congruent modulo n, which signifies that a and b have the same remainder when divided by n. This concept plays a crucial role in understanding equivalence relations, as it establishes a way to group integers into classes based on their remainders, revealing important properties such as reflexivity, symmetry, and transitivity within these groups.
congrats on reading the definition of a ≡ b (mod n). now let's actually learn it.