- #1

- 15

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Hello first of all!

I have two questions:

**1. Why is there a minus before the expression in the red circle?**

2. How did the x((n-1)-1) in the last line come to be?

2. How did the x((n-1)-1) in the last line come to be?

More precise: I understand the first parts. It's the random walk and x signifies the position of a particle after n steps. Then (n-1) ist the position of teh particle having moved to either the left or right side (this is 1-dimensional) and the δ is the distance the particle has travelled.

__But why is there a minus in the third line before the second 1/N? I mean how do I imagine that visually?__I kind of have a notion but I can't really grasp it.

__And then in the last line why is the [x(n-1)] the same as [x((n-1)-1)]?__Huh??? oO

Okay, here is the equation:

Thanks a lot already!

Vera