=+

(c) Adopting the point of view of part (a), let g.(x1, ..., x,) be the result of integrating the variable (ym+), y+2) ... ) out (with respect to w) from f(x) ,.;., x ,., y„.+1, ... ). This may suggestively be written as f(x ..... Y+1,Y+2 .... )dyn+ dyn+2 ....