Who is Descartes from The Problems of Philosophy and what is their importance? The_Problems_of_Philosophy English & Literature Descartes | The Problems of Philosophy

Famous 17th century early modern philosopher who invented the radical method of "critical doubt" where one doubted everything one could know and then built knowledge up from indubitable foundations. Russell does not think we need to doubt so radically but he does think that all knowledge should be built up from indubitable foundations.