
Riemann's green is a green pigment ZnO.CoO, which is obtained by heating a mixture of zinc oxide and cobalt nitrate or by the reaction of cobalt nitrate with either or zinc sulphate.

If a vector A is multiplied by a real number (say n), the vector of same nature is obtained but its magnitude is n times that of A.

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1. sol:
P | q | ~p | ~p ^ q |
T T F F | T F T F | F F T T | F F T F |
Happy Mother's Day, sir.