He met Brouwer at the annual meeting of the German Mathematical Society in Marburg where both gave lectures and Urysohn mentioned Brouwer 's error, and his counter-example, in his talk.
Siya matugunan Brouwer at ang taunang pulong ng German matematiko Kapisanan sa Marburg kung saan ang parehong ibinigay lektura at Urysohn nabanggit Brouwer 's error, at ang kanyang counter-halimbawa, sa kanyang makipag-usap.