5. Descartes, Rene(1596-1650), a famous French philosopher, mathematician and scientist. was one of the most influential thinkers in history. He is considered the founder of both modern philosophy and analytic geometry. During his life, established ideas were being challenged, so he tried to develop a way to reach the truth. He based his theory that the world is made up of mind and matter on a concept that came to him in a dream. For further information, check out the webpage athttp://www.xrefer.com/entry/551791 6. cogito ergo sum, is Latin for"I think; therefore, I exist, "a key point in Descartes philosophy. He claimed that the only thing anyone can be certain of is that s/he thinks and. therefore. s/he exists. The "i" is the mind which can exist without being extended so that it can in principle survive the death of the body. You can checkoutthewebpageathttp://www.xrefer.com/entry/551611forfurther information5. Descartes, Rene (1596-1650), a famous French philosopher, mathematician and scientist, was one of the most influential thinkers in history. He is considered the founder of both modern philosophy and analytic geometry. During his life, established ideas were being challenged, so he tried to develop a way to reach the truth. He based his theory that the world is made up of mind and matter on a concept that came to him in a dream. For further information, check out the webpage at http://www.xrefer.com/entry/551791. 6. cogito ergo sum, is Latin for "I think; therefore, I exist," a key point in Descartes' philosophy. He claimed that the only thing anyone can be certain of is that s/he thinks and, therefore, s/he exists. The "I" is the mind which can exist without being extended so that it can in principle survive the death of the body. You can check out the webpage at http://www.xrefer.com/entry/551611 for further information