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ÓÇÅË
ÓÇÅË — âñÿêàÿ êðèâàÿ èç ñåìåéñòâà óçëîâ (ñì. Óçëû).  ÷àñòíîñòè, óçëàìè ÿâëÿþòñÿ êàïïà, ñòðîôîèäà. Èíâåðñèÿ Ó. ñ öåíòðîì èíâåðñèè â íà÷àëå êîîðäèíàò åñòü òàêæå Ó., êîíãðóýíòíûé äàííîìó, íî ïîâåðíóòûé âîêðóã íà÷àëà íà 90°. Ñì. Ó. òàêæå â òåðìèíå Îñîáàÿ òî÷êà.