So what exactly is a complex number?

Grzegorz Słodkowicz jergosh at wp.pl
Thu Sep 6 23:00:56 CEST 2007


Gabriel Genellina wrote:
> En Wed, 05 Sep 2007 06:45:29 -0300, Grzegorz Słodkowicz <jergosh at wp.pl>  
> escribi�:
>
>   
>> I believe vectors can only be added if they have the same point of
>> application. The result is then applied to the same point.
>>     
>
> You are talking about "forces", not "vectors" in general. Using the "point  
> of application" is just a convenient way of condensing two things: the  
> resultant force -a vector- and the resultant momentum -a pseudovector-  
> into a single entity, and only makes sense for a rigid body.
>From the Wikipedia (http://en.wikipedia.org/wiki/Vector_%28spatial%29): "Two vectors sharing the same initial point can also be added or subtracted."


Regards,
Greg



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