EN
In his 'Crisis of European Sciences' Husserl reports that he has made a discovery of the 'deep structure' of the experienced world (a priori 'Lebenswelt') which plays a fundamental role in cognition. It is the most essential condition of knowing the truth about the world and it is a metaphysical structure that determines the world's mode of existence. Husserl defined this structure as the 'primary ratio' that underlies all forms of rationality, including also scientific rationality.