TariqMy brain's not working.
Is the multiplicative inverse of 1 modulo n always 1, and nothing else?
Of course 1*1=1 ... but I'm doubting myself and wondering if modulo arithmetic opens other possibilities.
Joana de Castro Arnaud@rzeta0 4 × 4 = 1 (mod 5), for instance. Things get weirder if the modulo isn't prime: 3 × 4 = 0 (mod 6).