An example is given here: http://en.wikipedia.org/wiki/Non-Borel_set Any set that is easy to think of will be a Borel set, so an example of a non-Borel set will be complicated. Another approach: All Borel sets are Lebesgue measurable. The axiom of choice can be used to give an example of a non-measurable set, and this set will also be a non-Borel set. See http://en.wikipedia.org/wiki/Non-measurable_set = =
Rae Michael Shortt has written: 'Measurable spaces with c.c.c' -- subject(s): Borel subgroups, Function spaces, Lattice theory 'Lars Valerian Ahlfors'
Annik Borel's birth name is Borel, Anne.
Louis Borel's birth name is Lodewijk Borel.
Adrien Borel died in 1966.
Adrien Borel was born in 1886.
Ernest Borel was created in 1856.
Jacques Borel died in 2002.
Jacques Borel was born in 1925.
Felice Borel died in 1993.
Petrus Borel died in 1859.
Petrus Borel was born in 1809.