[R] Different value between R variance and definition of variance

[Tine]

Hi!

Let us define random variable:
 > x = seq(0,1,length=100)

If we calculate variance following definition E[(x-E(x))^2] we get:
 > mean( (x - mean(x))^2 ) # == mean(x^2) - mean(x)^2
0.08501684

And if we use internal R function var:
 > var(x)
0.08587559

Can anyone tells me why the difference?