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1913
 
     
Alfred North Whitehead and Bertrand Russell complete a work of mathematical logic, Principia Mathematica        
1921
 
    
Ludwig Wittgenstein publishes his influential study of the philosophy of logic, Tractatus Logico Philosophicus       
1923
 
    
In I and Thou the Austrian theologian Martin Buber interprets religion in terms of the subjective experience of interpersonal relationships       
1927
 
    
In Being and Time German philosopher Martin Heidegger makes an existentialist case with Dasein ('Being There') as the central theme       
1936
 
     
In Language, Truth and Logic 26-year-old A.J. Ayer produces a classic exposition of Logical Positivism        
1943
 
     
French philosopher Jean-Paul Sartre expounds his theory of existentialism in Being and Nothingness ('L'Être et le néant')        
1945
 
    
Austrian philosopher Karl Popper publishes The Open Society and its Enemies