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  4. Bertrand Russell
  5. I am delighted to know that Principia Mathematica can now...

I am delighted to know that Principia Mathematica can now be done by machinery. . . I am quite willing to believe that anything in deductive logic can be done by machinery.

Bertrand Russell
Believe, Done, Belief
I am delighted to know that Principia Mathematica can now be done by machinery. . . I am quite willing to believe that anything in deductive logic can be done by machinery.