I dont know if here is right local for put this doubt, but i need of help in understand this lette "k" that appear in many formulas, how in page 2 in topic "2.1 The Insertion Neighborhood" in formula:
vij (k) =
k if k < i or k > j
k + 1 if i < k ≤ j
j if k = i.
What's this lette k. I don't get understand. Help me.