title: what does log* (log n) mean,what will it represent
body: <p>what does log* (log n) mean? what does the * represent? what is its expansion to compare with other logarithmic function like log(log n)??which one is greater among log* (log n) and (log(log n)^log n)</p>
  
  <p>My approach to solve which one is better:
  applied log on both sides,but do not know what log(log* (log n)) will be</p>