5.1.4 Sandwich rule

• 5.1.4 Sandwich rule ⪢⪢
Let f, g and h be three functions satisfying f(x)≤g(x)≤h(x) in some detected neighborhood of x=a. If ⎾f(x)⏐x￫a⏌=⎾h(x)⏐x￫a⏌= L then ⎾g(x)⏐x￫a⏌= L.
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