MacTutor
16th June
On this day in 1902, Bertrand Russell wrote to Gottlob Frege to say that in his Grundgesetze der Arithmetik:
On this day in 2003 Google released an Escher doodle (a day early).
... there is just one point where I have encountered a difficulty.The difficulty was the Russell Paradox. Frege responded
... your discovery of the contradiction caused me the greatest surprise and, I would almost say, consternation, since it has shaken the basis on which I intended to build arithmetic.
On this day in 2003 Google released an Escher doodle (a day early).