Resolve "P-invaranti"

• Cambio genere di P-invarianti da F a M
• Riformulazione per il passaggio da hm=hm' a hm=h(m+Cs) Closes #23 (closed)

added 3. In attesa di review label

assigned to @matteo.yon

added 3 commits

• c7d10c67...a3a7c22c - 2 commits from branch master
• a07c6bd5 - Fix gender of P-invarianti and applied suggestion by Prof. Bellettini

Compare with previous version

merged

mentioned in commit 1729df96