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Is ray AB always the same as ray BA?
Yes, provided it is the ray. If AB is a vector then the answer is no.
How do you calculate magnitude and direction of a resultant vector by parallelogram law?
To find the resultant of 2 vectors, P and Q, let the ray AB represent the vector P. Let AB (not BA) be in the direction of P and let the length of AB represent the magnitude of P. Let BC represent the direction of Q and the length BC represent the magnitude of Q [on the same scale used for P and AB]. Then the straight line AC, which is the diagonal of the parallelogram with sides representing P and Q, is the resultant vector R, with magnitude and direction represented by AC.The vectors P and Q can also be represented as sides AB and AC. In that case you will need to complete the parallelogram and the resultant is represented by the diagonal through A.
Is AB the same as BA?
Yes.
Is Ray AB the same as Ray BA?
yes
Odd number of a's and even number of b's in regular expression automata?
[(aa + bb) + (ab+ba)(aa+bb)*(ab+ba)]*[a + (ab+ba)(aa+bb)*b]
