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  1. Q

    Linear optimization problem.

    First let me clarify this is not a homework question. This part has cropped up as part of a small project i am doing on Cosmic microwave background. How would i go about minimizing the function f(x_{1},x_{2}...x_{n})=\Sigma*x_{i}*a_{i} subject to the constraint: \Sigma x_{i}*(2*i+1)=constant...
  2. Q

    How to multiply two groups

    Everyone must be familiar with U(1),SU(2) and SU(3) Lie groups in particle physics . But how does one define the multiplication of two groups of different dimensions aka SU(2) X U(1) or SU(3) X SU(2) X U(1).