If two curves [img]http://mathworld.wolfram.com/nimg251.gif/img] and 
of multiplicities 
and 
have only ordinary points or ordinary singular points and cusps in common, then every curve which has at least multiplicity
at every point (distinct or infinitely near) can be written
where the curves
and 
have multiplicities at least 
and 
of multiplicities and have only ordinary points or ordinary singular points and cusps in common, then every curve which has at least multiplicityat every point (distinct or infinitely near) can be written
where the curves
and have multiplicities at least and 
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