= André Guerra
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André Guerra coauthored notes on <elliptic partial differential equations> with <Gerard Orriols>. Their exposition develops <harmonic functions>, <maximum principles>, <Schauder estimates> and regularity theory. The treatment connects a priori bounds with existence arguments, explaining why controlling derivatives can help prove that a boundary-value problem has a solution.<Lecture notes on Elliptic Partial Differential Equations by André Guerra and Gerard Orriols>[Contents and Sections 4.4–4.5]{ref}
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