a + ( b 1 2 3 + ( c 2 3 + ( d 3 + a + b 1 ) + c 1 2 ) + d 1 2 3 ) ( a + E ) 3 a + ( b + ( c + d ) 2 + e ) 3 + ( f + ( g + h ) 2 + i ) 3 a + P ( η ( x ) → 1 ) = ∑ = N 0 ∞ ∑ = j 0 N P ( N x = N and - j 1 N < T x ≤ j N ) ¯ C ( y ∘ ( x ) , T x )