The 3-tuple (55, 20, 21) as a set

An n-tuple (x1,...,xn) is an ordered list of n sets. It can be constructed in several ways. A popular definition is the original set x1 for n=1 and the ordered pair ((x1,...,xn-1),xn) otherwise.

Klick on the ordered pair ( 55, 20 ) or the natural number 21 to see how it may be defined as a set.

(55, 20, 21) = ( ( 55, 20 ), 21 )

(back to √2)