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ÃËÀÄÊÎÅ ÎÒÎÁÐÀÆÅÍÈÅ
ÃËÀÄÊÎÅ ÎÒÎÁÐÀÆÅÍÈÅ. Ïóñòü è — ïðîñòðàíñòâà ïåðåìåííûõ è ñîîòâåòñòâåííî, è — îáëàñòè â è . Âñÿêîå îòîáðàæåíèå îïðåäåëÿåòñÿ ôóíêöèÿìè:
, (*)
Îòîáðàæåíèå íàçûâàåòñÿ Ã. î., åñëè ôóíêöèè (*) ÿâëÿþòñÿ ãëàäêèìè ôóíêöèÿìè. Òåðìèí «ãëàäêàÿ» ôóíêöèÿ îçíà÷àåò ôóíêöèþ, âñå ÷àñòíûå ïðîèçâîäíûå êîòîðîé, äî ïîðÿäêà âêëþ÷èòåëüíî, íåïðåðûâíû (òîãäà ãîâîðÿò î ãëàäêîñòè êëàññà ).
Ðàññìàòðèâàþò òàêæå Ã. î. ìíîãîîáðàçèé.
Ïóñòü îòîáðàæåíèå ìíîãîîáðàçèÿ â ìíîãîîáðàçèå , , ; — êîîðäèíàòíûå îêðåñòíîñòè òî÷åê è ñîîòâåòñòâåííî, îòîáðàæåíèÿ , îïðåäåëÿþò ëîêàëüíóþ ñèñòåìó êðèâîëèíåéíûõ êîîðäèíàò â .
Îòîáðàæåíèå / íàçûâàåòñÿ Ã. î., åñëè äëÿ ëþáîé ïàðû òî÷åê è äëÿ ëþáîé ïàðû êîîðäèíàòíûõ îêðåñòíîñòåé , ñîäåðæàùèõ òî÷êè è ñîîòâåòñòâåííî, îòîáðàæåíèå ÿâëÿåòñÿ Ã. î.
Ã. î. èìååò ñìûñë ðàññìàòðèâàòü òîëüêî äëÿ ãëàäêèõ ìíîãîîáðàçèé (òîé æå èëè áîëåå âûñîêîé ñòåïåíè ãëàäêîñòè).
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