# Up-Grade Your Current ZSTK474 In About Half The Time Without Spending More Cash!

Proof ��Let A be an n-fold p-ideal of G. Considering that (xzn)(yzn) xy, from (xzn)(yzn) A and by Corollary 32, we get xy A. So, any n-fold p-ideal satisfies this implication.The converse statement is evident.Theorem 37 ��An n-fold p-id read more...