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Envelope (mathematics)
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==Generalisations== The idea of an envelope of a family of smooth submanifolds follows naturally. In general, if we have a family of submanifolds with codimension ''c'' then we need to have at least a ''c''-parameter family of such submanifolds. For example: a one-parameter family of curves in three-space (''c'' = 2) does not, generically, have an envelope.
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