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Quick mathmatical notation question

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I'm having some trouble with an equation please could you help. It's a problem related to 3D polygons and collision detection, take the following: A and B are 3 sided polygons P is a point on A P1 and P2 are vectors to the points on A from P that share P as their origin Qi (1 >= i <= 3) are the vertices of B qi (1 >= i <= 3) are the vectors for the sides of B In the following equation take (a) to be the greek symbol for alpha and (b) to be the greek symbol for beta P + (a)1 x p1 + (a)2 x p2 = Qi + (b)i x qi What does the alpha symbol stand for in this equation? From having a look around I think it stands for the opposite angle formed where p1 meets P1 or p2 meets P2. This makes sense to me but I want to be sure since getting it wrong will lead me to only further increase the errors I'm getting as I get further into this work. Thanks for any help, Marx!

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