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==Major and foundational results==
There are four major theorems which are sometimes called the four pillars of functional analysis:
* the [[Hahn–Banach theorem]] * the [[Open mapping theorem (functional analysis)|open mapping theorem]] * the [[Closed graph theorem (functional analysis)|closed graph theorem]] * the [[uniform boundedness principle]], also known as the [[Banach–Steinhaus theorem]]. Important results of functional analysis include: ===Uniform boundedness principle===
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