Comment Comment by 0x7f800000 Clock arithmetic.Modulo 4: a clock with only four evenly-spaced marks on it.17 is congruent to 1 (modulo 4) means:Starting at the top of the clock, go clockwise one mark.Starting at the top of the clock, go clockwise seventeen marks.You'll end up at the same position.That's congruence. parent 0x7f800000 8 years ago
Modulo 4: a clock with only four evenly-spaced marks on it.
17 is congruent to 1 (modulo 4) means:
Starting at the top of the clock, go clockwise one mark.
Starting at the top of the clock, go clockwise seventeen marks.
You'll end up at the same position.
That's congruence.