# Search results

1. ### Physics Guidance for a maths student

I think that a much better and alternative should be studying the Greiner series: http://onphysicsbooks.blogspot.com/2009/01/walter-greiner.html
2. ### Best next step for tackling quantum mechanics?

Take a look at this blog. The author is doing a study of Griffiths' book on Quantum Mechanics: http://physicsfromthebottomup.blogspot.com/2009/02/the-quantum-gang.html You'll see a lot of explanations and solved exercises and I think that with your background you are able to understand what's...
3. ### Euclid's proof of infinitude of primes

This is the gist of the argument: 1- The result of the multiplication of integers is an integer. Hence p_1p_2...p_n is an integer 2- The result of the addition of integers is an integer. Hence p_1p_2...p_n+1 is an integer 3- The fundamentel theorem of arithmetics states that all natural...
4. ### How to calculate general trendline for a time series

Thanks for your reply Stephen and sorry for not being specific enough. In that case let us assume that I'm analyzing the sales of a given product on given time frame (say 6 months). What I want to be able to do is: understand if the sales are experiencing an upward or downward tendency...
5. ### How to calculate general trendline for a time series

Hi there, Given a time series with data points x_1, x_2, x_3,...,x_n I want to be able to extrapolate its future behaviour. I can see three options: \sum_i (x_(i+1)-x_i)/x_i count of how many terms of (x_(i+1)-x_i) are positive and negative Assume linearity and calculate m for the best...