13 is at least the difference of a number v and 1.

Answer 1

13 > v-1

14 > v

the number v is equal to or less than 14

that's probably the answer you want

but maybe

13 > 1-v

then

12 > -v

-12< v

v > -12

the number v is equal to or greater than -12

13> |v-1| gives both solutions