It had been observed by Joseph Neuberg, in 1884, that the three points P A {\displaystyle P_{A}} , P B {\displaystyle P_{B}} , and P C {\displaystyle P_{C}} lie on a common line R {\displaystyle R} .
Нойберг (J. Neuberg) в 1884 году заметил, что три точки P A {\displaystyle P_{A}} , P B {\displaystyle P_{B}} и P C {\displaystyle P_{C}} лежат на одной прямой R {\displaystyle R} .