1. The problem statement, all variables and given/known data Prove J(-m) = [(-1)^m][J(m)] (Note: by "J(-m)" I mean "subscript (-m)") 2. Relevant equations J(-m) = sum [((-1)^n) * (x/2)^(2n-m)]/[n! [tex]\Gamma[/tex](n - m + 1)] J(m) should be obvious. 3. The attempt at a solution I tried just plugging in the above formulas hoping to get a simplified answer, but I know I'm missing something in that denominator.