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The aim of this paper is to study the symmetry properties of solutions of bi-harmonic differential equations of the type Δ𝟐+||-| 𝜶 𝒖 = 𝟎 and Δ𝟐 𝒖 + 𝒇(𝒖) = 𝟎 𝒊𝒏 𝛀 ⊂ 𝑹𝟐 We employ the method of moving planes, which is based on the Maximum principles in...
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