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Help: Column/Row Vector


Hi,

I have two vectors x=(x1,x2) and y = (y1,y1). How can I persuade Mathematica
that e.g. x is a column vector and y is a row vector, which is kind of 
important for their multiplication .
I've studied the help page for hours, with no result. So could  
someone please help me. My email address is: 

khinast at nld.chee.uh.edu


Joh.



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