X and x (x (x), A (mz) R = {GB, let it be {{2, 1}, {1 } } = A then b) let (R, d) be the regular metric space and let it be AC IR where {2n, ne N } = = A = max A = c) if { A = { , ne N then d) in space Ordinary metric (R, d) open balls can be written as intervals n = B2 ( 0 ) 2 B3 ( -1 ) || a) If {2,3,1 = B} = e) If [2,4-) = A in (R, d), then A = %3D