minusminusxxminux+xy+minusyminusx+minusx+xyy++xyminusyx2.11minus111minux1121+222112minusminusxx1minus101AProVEAProVE Commit ID: 794c25de1cacf0d048858bcd21c9a779e1221865 marcel 20200619 unpublished dirty Statistics for single proof: 100.00 % (3 real / 0 unknown / 0 assumptions / 3 total proof steps)http://aprove.informatik.rwth-aachen.deJohnDoe