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, 16 2010 . 10:43 +

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http://elementy.ru/lib/430178/430281
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http://en.wikipedia.org/wiki/Cusp_(singularity)

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_   , 16 2010 . 20:25 ()
http://en.wikipedia.org/wiki/Cusp_(singularity)

   
_   , 16 2010 . 20:31 ()
http://en.wikipedia.org/wiki/Caustic_(mathematics)
http://en.wikipedia.org/wiki/Cusp_(singularity)
http://en.wikipedia.org/wiki/Caustic_(optics)

   
_   , 16 2010 . 20:37 ()
http://en.wikipedia.org/wiki/Caustic_(mathematics)

   
_   , 17 2010 . 15:28 ()
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_   , 17 2010 . 21:20 ()
http://www.trinitas.ru/rus/doc/0232/009a/02321168.htm
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