Function mmaKeyLess

src/compute-engine/rubi/rubi-utils.ts:1155–1159

(a: string[], b: string[])

  }
  if (u.symbol) return true;
  if (u.operator === 'Power' && u.ops) {
    const e = u.ops[1];
    if (isLiteralInteger(e)) {
      const k = realNum(e);
      return k !== null && k % 2 === 0 ? true : posAux(u.ops[0]);
    }
    return true;
  }