Philosophy

Philosophy is attempted to comprehend most fundamental principles of the world and thinking. Philosophy focuses not on observation and experiment, but on thinking itself.  Philosophy uses a priory approach that inherent in mathematics, but philosophy deals not with quantity, but with quality structures of the world. Mathematics succeeded, but philosophy failed, especially when faced with successful attempts of science to investigate the world a posterior.  However, the world as a whole is unknown, and so you can continue to imagine what it is. Other philosophers are focusing on language's usage or mind's structure or on their own imagination, or they are studying history of philosophy.