Infinity is used as a base point in homemorphic transformation to study infinity for a class of fifth system and isochronous center problems.
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美
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摘要通過(guò)同胚變換把系統無(wú)窮遠點(diǎn)化為原點(diǎn),研究了一類(lèi)五次系統無(wú)窮遠點(diǎn)中心與擬等時(shí)中心問(wèn)題。
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