5.2.5 Sandwich rule

• 5.2.5 Sandwich rule ⪢⪢
Let f, g and h be functions such that f(x)≤g(x)≤h(x) for all x in some neighborhood of c and such that f(c)=g(c)=h(c). If f and h are conyinuous at c, then so is g.
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