minusXsYpredminusXYminusX0XpredsXXlesXsYleXYlesX0falsele0Ytruegcd0Y0gcdsX0sXgcdsXsYifleYXsXsYiftruesXsYgcdminusXYsYiffalsesXsYgcdminusYXsX2.1minusXsYpredminusXYminusXsYminusXYlesXsYleXYgcdsXsYifleYXsXsYgcdsXsYleYXiftruesXsYgcdminusXYsYiftruesXsYminusXYiffalsesXsYgcdminusYXsXiffalsesXsYminusYXtrueiftruesXsYgcdminusXYsYgcdsXsYifleYXsXsYiffalsesXsYgcdminusYXsXtrue123456if300gcd200141if31213true00s1111gcd211112minus211le21false00pred111000iftruesXsYgcdminusXYsYiffalsesXsYgcdminusYXsXminusXsYpredminusXYminusX0XpredsXXiftruesXsYgcdminusXYsYfalseiffalsesXsYgcdminusYXsXfalseiftruesXsYminusXYfalse24iffalsesXsYminusYXfalse13minusXsYminusXYtrue2minus200231minus21112s1111minusXsYpredminusXYfalse2gcdsXsYleYXfalselesXsYleXYtruele2101le20s1111
AProVE
3d3b40ebf1f1cc0cfb76e51606fb79299fd7ea19 rene 20120105 unpublished dirty
http://aprove.informatik.rwth-aachen.de/
John
Doe