### nt.number theory - Siegel's Mass Formula for ternary ...

4. In his paper " On the theory of indefnite quadratic forms ", Siegel gives the formula (Thm. 1) μ ( S, T) = ∏ p α p ( S, T), where. S is an m × m non singular integral symmetric matrix of signature ( r, m − r), T is an n × n integral symmetric matrix, μ ( S, T) is the measure of …