# Binomial tree notation

Can someone clarify for me the notation of the nodes in a binomial tree with more than 1 step? Is this notation correct?

It's more likely that people are familiar with the below representation - John Hull - of a 2-step binomial tree that you described. However, by analogy, your representation (although not conventional) is fine too, as long as S,u,d are materialized by the index increments [i,j] at each node.
• i++ for each upward / downward trend (1 increment)
• j++ for each uptrend trend (idem), whereas j=0 in case of downtrend