Recent content by titowakoru

I was reading an article and came across the idea that cosmological measurements of the angular distance diameter could be used to prove that supernova dimming did not occur due to dark energy. However I could not wrap my head around it. Angular distance diameter is giving by: dA = x / θ...

Ah, I see. So applying the chain rule with respect to r would mean that 4πR^2 would disappear because the derivative of a constant is zero?

Homework Statement The question I am trying to answer requires me to find the following: dN/dS ∝ S^−5/2/cosh(r/R) and I am giving the follwing equation in the question. A=4πR^2 sinh^2⁡〖(r/R)〗 The Attempt at a Solution Right I know how to get the S^-5/2 in the top half of the...

Hi, I was wondering if some one could check my understanding of limits please. If a limit is presetned as say x << y or x >> y am I right in thinking that x or y can be ignored as they are small enough to be insignificant? So, for example, if I had equation which was sin(x/y) in...