L`ensemble des nombres réels - mpsi-lycee-saint

R
R
eπ√163
12,594167167167167...
C= 0,123456789101112131415...
C c0c1...cn
0,99999... ]0; 1[
x x0
I=]3,141592653589; π[I
]0,1[
]0,1[ a0, a1, ..., an, ... x
n an
x x