A Logical Calculus of the Ideas Immanent in Nervous Activity 399 



of temporal studies of nervous activity: and to mathematical bio- 

 physics the theory contributes a tool for rigorous symbolic treat- 

 ment of known nets and an easy method of constructing hypo- 

 thetical nets of required properties. 



REFERENCES 



1. Carnap, R.: The Logical Sjntax of Language. New York, Harcourt. 



Brace and Company, 1938. 



2. Hilbert, D., und Ackermann, W.: Grundiige der Theoretischen Logik. 



Berlin, J. Springer, 1927. 



3. Whitehead, A. N., and Russell, B.: Principia Mathematica. Cambridge, 



Cambridge University Press, 1925. 



