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Sandwich theorem is also known as squeeze theorem. As shown in the figure 9.27, if f(x) is ‘squeezed’ or ‘sandwiched’ between g(x) and h(x) for all x close to x0, and if we know that the functions g and h have a common limit l as x → x0 , it stands to reason that f also approaches l as x → x0 .
Theorem 9.5 (Sandwich Theorem)
If f , g, h : I ⊆ R→R such that g ( x) ≤ f ( x) ≤ h ( x) for all x in a deleted neighbourhood of x0 contained in I, and if
We could have wrongly concluded had we resorted to applying the limit theorems, namely
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