4.38.2 Greatest hits from previous weeks

4.38.2.1 How to find the position of elements in a list satisfying criteria

https://mathematica.stackexchange.com/questions/180/how-to-find-the-position-of-elements-in-a-list-satisfying-criteria

 
Say I have a list x={2,4,6,8,10} and I want to find out the positions of the elements that are greater than 7. 
 
Select[x, #>7&] gives the elements themselves, and Position[x,8] gives the  ...
 

- asked by PeterR (47 votes), answered by J. M. (45 votes)

4.38.2.2 How to calculate contour integrals with Mathematica?

https://mathematica.stackexchange.com/questions/34073/how-to-calculate-contour-integrals-with-mathematica

 
How to calculate the integral of $\frac{1}{\sqrt{4 z^2 + 4 z + 3}}$ over the unit circle counterclockwise for each branch of the integrand?
 

- asked by user64494 (30 votes), answered by Artes (53 votes)