NO
Nontermination proof succeeded
Found this recurrent set for cutpoint 5: arg1 <= -1 and arg1P <= -1 and arg2 <= -2 and arg2P <= -2 and arg1-arg2P <= 1 and arg2P-arg1 <= -1 and arg1+arg2P <= -3 and arg1P-arg1 <= 0 and arg1-arg1P <= 0 and arg1P+arg1 <= -2 and arg1P-arg2P <= 1 and arg2P-arg1P <= -1 and arg1P+arg2P <= -3 and arg2-arg1 <= -1 and arg1-arg2 <= 1 and arg2+arg1 <= -3 and arg2-arg1P <= -1 and arg1P-arg2 <= 1 and arg2+arg1P <= -3 and arg2-arg2P <= 0 and arg2P-arg2 <= 0 and arg2+arg2P <= -4 and arg2-arg1+1 <= 0 and arg2+1 <= 0 and arg1 <= 0 and arg2 <= 0
Errors: