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April 3, 2021 7:50 am 30 pts
20. The operator 1- + ay a four dimensional operator is known as (A) Laplace operator (B) Lorentz operator (C) Hermitian operator (D) d'Alembertian operator
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The operator in given question is known as the D'Alembertian operator which is used in K.G. equation and Lorentz gauge. option D is correct.