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About LinkBacks1) {}=Q , E={x
X : g(x)<f(x)}
Show that E=[{x
{x
2) {x
If f(x) is a countable function show that a-f(x) is countable function too.
Before spending time on this please make sure this is what you mean.Originally Posted by SENTINEL4
1) {
Show that E=
2) {x
If f(x) is a countable function show that a-f(x) is countable function too.
![E = \bigcup\limits_n {\left[ {\left\{ {x \in X:g(x) < r_n } \right\} \cap \left\{ {x \in X:f(x) > r_n } \right\}} \right]}](http://latex.codecogs.com/png.latex?E = \bigcup\limits_n {\left[ {\left\{ {x \in X:g(x) < r_n } \right\} \cap \left\{ {x \in X:f(x) > r_n } \right\}} \right]} )
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