Expression 45: "M" Subscript, 1 , Baseline equals StartFraction, StartNestedFraction, 1 NestedOver "m" Subscript, 1 , Baseline , EndNestedFraction "N" Subscript, 1 , Baseline plus "N" Subscript, 2 , Baseline plus StartNestedFraction, negative 1 NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction "P" Subscript, 1 , Baseline minus "P" Subscript, 2 , Baseline Over StartNestedFraction, 1 NestedOver "m" Subscript, 1 , Baseline , EndNestedFraction minus StartNestedFraction, 1 NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction , EndFractionM1=1m1N1+N2+−1m2P1−P21m1−1m2