First, do we have to exclude the cases, where $(x,y,z)$ are not all even or odd and then show the only possibility ?
or is there a geometric solution maybe ?
Asked
Active
Viewed 131 times
4
-
2I have a truly marvellous proof of this, but the answer box is too small to contain it. – user85798 Nov 20 '13 at 00:59
-
3See http://math.stackexchange.com/questions/571622/positive-integral-solutions-of-3x4y-5z – Ivan Loh Nov 20 '13 at 01:03