Formas bilineales simétricas reales. Ley de inercia de Sylvester.
https://us02web.zoom.us/rec/share/XtRAW3q_y3EoH1KkojbMQQ7PWvYU5cgb8r9Xe7wwBMZMelbToek7pHp9L9y6wqkj.Y-2X2ihl5XP98Rid?startTime=1604501052000
https://us02web.zoom.us/rec/share/yGOM-n4hiXqyZui4D2LhA6R19bUMdT9ycCsvRamZh_Gr6huesrxZZluoLuSMHDk-.qulP4ovbsYIvYP4e?startTime=1604673557000
