Two Infinite Families of Regular Sequences of Power Sums in Three Variables

RESUMO

Let $$ S=\mathbb{C}[x,y,z],\qquad p_m=x^m+y^m+z^m. $$ For every $r\geq1$, we prove that $$ p_r,\ p_{r+1},\ p_{3r+1} \qquad\text{and}\qquad p_r,\ p_{r+1},\ p_{3r+2} $$ are regular sequences exactly when $r\not\equiv1\pmod3$. This proves the Conca--Krattenthaler--Watanabe prediction for two infinite families. The proof is elementary. Four simple reductions modulo $(p_r,p_{r+1})$ reduce the problem to the two equations $x+y+z=0$ and $xy+xz+yz=0$.