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ÓÐÎÂÍß ËÈÍÈÈ
— ëèíèè â äâóìåðíîì ñêàëÿðíîì ïîëå , äëÿ êîòîðûõ
; ïðè ýòîì ÷àñòî òðåáóåòñÿ,
÷òîáû
èìåëà
íåïðåðûâíûå ÷àñòíûå ïðîèçâîäíûå è ÷òîáû ýòè ïðîèçâîäíûå íå îáðàùàëèñü âñå îäíîâðåìåííî
â íóëü. Êàæäîìó çíà÷åíèþ ïîñòîÿííîé
ñîîòâåòñòâóåò îïðåäåëåííàÿ Ó. ë. Ó. ë.
íå ïåðåñåêàþòñÿ ìåæäó ñîáîé. Ãðàäèåíò ñêàëÿðíîãî ïîëÿ â êàæäîé òî÷êå ïîëÿ
íàïðàâëåí ïî íîðìàëè ê Ó. ë.