Изменения

<tex>(X, \mathfrak{A}, \mu), \quad (Y, \mathfrak{B}, v\nu)</tex><br><tex>X \times Y</tex> - — декартово произведение, <tex>\mathfrak{A} \times \mathfrak{B} = \{a \times b | \mid a \in \mathfrak{A}, b \in \mathfrak{B}\}</tex><br><tex>m: \colon A \times B \to R^+, \quad m(a \times b) = \mu(a) \cdot v\nu(b)</tex><br><tex>m</tex> - — произведение мер <tex>\mu, v\nu</tex> в <tex>(X \times Y, \mathfrak{A} \times \mathfrak{B}, m)</tex>