I Proving Vector Space of Circles is Not Axiomatic

mikeeey
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Hi
How can i prove that the set if circles does not form a vector space AXIOMATICALLY .
( i am not considering a circle lives in xy-plane ( subset ) as a subspace of xy-plane
 
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Could you check your post and perhaps re-formulate it in correct sentences so that it becomes understandable? Thank you.
 
Hey mikeeey.

You will need to define your addition and scalar multiplication operators and then check the usual 10 axioms.
 
Thread 'Derivation of equations of stress tensor transformation'
Hello ! I derived equations of stress tensor 2D transformation. Some details: I have plane ABCD in two cases (see top on the pic) and I know tensor components for case 1 only. Only plane ABCD rotate in two cases (top of the picture) but not coordinate system. Coordinate system rotates only on the bottom of picture. I want to obtain expression that connects tensor for case 1 and tensor for case 2. My attempt: Are these equations correct? Is there more easier expression for stress tensor...
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