Question

Why normal ordering in quantum field theory is important?

Answer 1

Answer:

Normal order in quantum field theory a product of quantum fields,is usually said to Normal ordered when all creation operators are to the left of all annihilation operators in the product.

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Answer 2

Answer:

HERE IS YOUR ANSWER

Explanation:

Normal order in quantum field theory a product of quantum fields , or equivalently their creation and annihilation operators is usually is said to be normal ordered ( also called Wick order) when all creation operators are to rhe left of annihilation operators in the product.

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