Talk:Summation over Cartesian Product as Double Summation

Here f is not precised in the theorem !


 * True. The person who wrote this page produced quite a quantity of non-rigorous, imprecise and in some cases completely incorrect material.
 * In this case it appears fairly straightforward to interpret $f$ as a general mapping on $S \times T$, although it has to be assumed without justification that its codomain is $\Bbb A$.
 * It is debatable as to whether this page merits continued inclusion in ; note the invocation of the mergeto template, alerting us to address this (when we are so motivated). --prime mover (talk) 21:52, 4 January 2022 (UTC)