Merge pull request #2 from julian-upc/master

actualize
Merge pull request #10 from julian-upc/master

Actualitzar
updated formulation of sheet 4
another update to sheet 4
Merge pull request #116 from cassandradecock/master

Homework 3 + codes
Merge pull request #11 from julian-upc/master

Actualitzar
Merge pull request #3 from julian-upc/master

Updating
new file
Fix
added code for sheet3
Create README
sheet3
Merge pull request #118 from aitor-perez/master

added code for sheet3
Merge pull request #117 from arnauplanas/master

sheet3: code, readme and diary
Merge pull request #119 from Gwenaelaurent/master

sheet3
Merge pull request #12 from julian-upc/master

actualitzar
errors corrected
Merge pull request #120 from Gwenaelaurent/master

errors corrected
Added sheet3 at last. Sorry for the lateness.
Merge pull request #121 from lafaillette/master

Added sheet3 at last. Sorry for the lateness.