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LSN/QFT-04004 Lesson Spin Statistics Connection and Causality

LETS/QFT-04001 Let's Talk -- Cauasality in Relativistic Quantum Field Theory

Covariant Description of Spin and Free Particle Dirac Wave Function


When I started teaching, I was asking the same question which every one asks:
What area  is cross section. Internet was not  yet invented. Combed through books
Found an excellent treatment in
R. D.Evans "The Atomic Nucleus" Tata McGraw Hill Publishing Co. (1955)
You always learn something extra from Masters..

As a bonus found definition and discussion cross section for waves.
Also when you go to quantum theory, since everything has dual nature.
You should ask which definition should be used Evas tells you that you can use any one.

Vectors and Tensors == Comments on Talk-1

Let's Start Talking :: Vectors and Tensor in Physics -1

This is first installment of a series called "Let's Start Talking" The topic selected is "Vectors and Tensors in Physics"
This is not popular article. It attempts to explain  Vectors and Tensors to serious students with as few equations as

LEC/QFT-03 Lie Algebra of PoinCare Group

LEC/QM-33 Charge Conjugation

LEC/QM-33 Time Reversal Invariance of Dirac Equation

LEC/QM-33 Parity Invariance of Dirac Equation