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# Matice forem
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<{ForumPost(poster="peci1", timestamp=2009-05-21 10:38:37)}> Ahoj, tak az po predterminu jsem si uvedomil, ze na cviku z algebry k formam nam byly predlozeny nejaky bludy. Muzete mi to pls zkontrolovat?    Mam matci bil. formy (a11 a12 ... a1N) (a21 a22 ... a2N) : ............... : (aN1 aN2 ... aNN)    Symetrizaci provedu tak, ze ji zleva vynasobim (X1 ... XN) a zprava tim samym sloupcovym vektorem. Vznikne polynom. Kdyz si zpatky z toho polynomu nasazim do matice prislusna cisla, ale s tim, ze kdyz jeden polynom nalezi **k** polickum, tak do kazdeho policka napisu prislusny koef./**k** . Tim ziskam symetrizovanou formu. To uz ale neni mat. bil. formy, ne? Je to teda matice jeji prislusne kvadraticke formy?    Diky ;) <{/ForumPost}>	# Format diskuse #
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<{ForumPost(poster="Tinka", timestamp=2009-05-21 16:43:33)}> Nemusis nic roznasobovat, z matice A bilin. formy dostanes maticu kvadr. formy tak, ze prvky na diagonale zachovas, a pre vsetky ostatne spravis (kedze matica musi byt symetricka) aritm. priemer z prvkov a<sub>ij</sub> a a<sub>ji</sub> a na prislusne miesta ich doplnis.    Takze pre maticu bilin. formy 2x2 ( 1 -2) ( 0 3)    bude vyzerat prislusna kvadr. forma takto: ( 1 -1 ) ( -1 3 )    ...kedze \[0 + (-2)] / 2 = -1 Samozrejme toto nefunguje v telese Z<sub>2</sub>, vzhladom na delenie dvojkou <{/ForumPost}>	Diskuse se delaji po vlaknech `== Tema ==`, dalsi prispevky se odsazuji pomoci `*, **, ***, ...` a podepisuji pomoci `~~~~`.
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