Solving Proju(Proju(v))=Proju(v) Mathematically

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Homework Statement

How would i go about solving Proju(Proju(v))=Proju(v) Just a note Proju(v) means the projection of v onto you

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The Attempt at a Solution

how would i go about solving this is mathematical terms, it is obvious when you do it geometrically but I am just not sure how i would go about doing it mathematically
 
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Hi mikee! :smile:

It should be obvious from the definition …

what definition of projection are you using? :smile:
 
haha ok i think I've got it i can just use the equations for the projections and if the right side equals the left side viola ha thanks
 

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