Primeros cambios en el N.N.
Problems Sheet2
lecture 6
Added the source codes for generating all the polytopes in sheet 4
Merge remote-tracking branch 'upstream/master'
Added Alex's encrypted solution to sheet 4
Merge branch 'master' of https://github.com/XaviTapia/discrete-geometry-lecture-notes into XaviTapia-master
included lecture 6 into main file
Merge branch 'alex-alvarez-master'