@book{ Solr-413867, title = {Principia mathematica to *56 / Alfred North Whitehead, Bertrand Russell.}, series = {Cambridge mathematical library}, author = {Whitehead, Alfred North, 1861-1947}, editor = {Russell, Bertrand, 1872-1970}, address = {Cambridge}, publisher = {Cambridge University Press}, year = {1962}, pages = {410}, note = {Comprises the abridged text of vol. 1 of Principia mathematica}, }