Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
ForAll[v0 , Exists [v1 ,(v0+1) * v1 === 1 mod 7]]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
