Friedmann equation
Hi does anyone know a website or paper where the friedmann equation is derived from the robertson walker metric?
it should have the calculation of atleast a few of the christoffel symbols etc thanks blumfeld 
The Friedmann equation can't be derived from the RW metric. It is a constraint on that metric, which is derived from the GR field equations. In other words, you can't derive it wityout the stressenergy tensor.

You may be interested in reading Relativity Demystified by David McMahon. On page 161 the following problem is worked out: Consider the RobertsonWalker metric and suppose we take the Einstein equation with nonzero constant, find the Friedman equations.

Hello Thank you for the reply
So the friedmann equation is a constraint on the metric derived from the stress energy tensor what specific stress energy tensor is used? just the diagonal {rho, p, p ,p }? also are theere any websites that have the derivation of this constraint equation from einsteins field equations>? i will also try to check out the book you recommended thanks! 
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