It is therefore natural to allow (5) to fail when $x$ is not a continuity point of  $F$.

It is natural to make the following definition.

In this case it is natural (and notationally convenient) to pick $W$ to be ......

A natural question to ask is how the quantities $A(S,T)$ and $B(S,T)$ vary as $S$ and $T$ change.

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