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Homework Statement
I am reading a book by Chandrasekhar, "Newton's Principia for a Common Reader." I don't understand some notation.
Homework Equations
(2) A(1)S(1) x A(1)D(1)=(A(1)B(1))^2
What does x means here? A cross product? Could you give me a hint where to find a good introduction to these geometrical operations? Obviously, there is a gap in my background.