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vector B : ci+dj

can both of this vector combine become the following matrix?

[tex]\stackrel{a}{c}[/tex] [tex]\stackrel{b}{d}[/tex] or [tex]\stackrel{a}{b}[/tex] [tex]\stackrel{c}{d}[/tex]

hope anyone can tell me more about this..coz i search a lot a wiki there..~~