CH is the abbreviation of Swiss Confoederation (taking the initials of Latin Swiss Confederation Confederatio).
The Swiss Confederation (German: Schweizerische Eidgenossenschaft, French: Confédération suisse, Italian: Confederazione Svizzera, Romance: Confederaziun svizra), referred to as "Switzerland" (English: Switzerland), is one of the countries in Central Europe, and the whole country is divided into 26 states.
Switzerland borders Germany to the north, France to the west, Italy to the south and Austria and Liechtenstein to the east. The whole territory is dominated by plateaus and mountains, and it is known as the "roof of Europe". Bern is the seat of the federal government.
In 1874, Georg Cantor guesses that there is no other cardinality between countable set cardinality and real number cardinality, which is the famous continuum hypothesis.
It is also called Hilbert's first question. 1900 at the second international congress of mathematicians, david hilbert listed Cantor's continuum hypothesis as the first of 23 important mathematical problems to be solved in the 20th century.
1938 godel proved that the continuum hypothesis is not contradictory to the world-recognized ZFC axiomatic system. 1963 American mathematician Paul Cohen proved that the continuous hypothesis and the ZFC axiomatic system are independent of each other.
Therefore, the continuum hypothesis cannot be proved to be correct in ZFC axiomatic system.