Expression 3: "p" left parenthesis, "n" , "f" , right parenthesis equals "f" Superscript, left parenthesis, "n" minus 1 , right parenthesis , Baseline minus "f" Superscript, "n" , Baselinepn,f=fn−1−fn
3
Expression 4: "d" left parenthesis, "f" , right parenthesis equals StartFraction, "p" left parenthesis, "N" , "f" , right parenthesis Over Start integral from 0 to 1, end integral, "p" left parenthesis, "N" , "t" , right parenthesis "d" "t" , EndFraction left brace, 0 less than or equal to "f" less than or equal to 1 , right bracedf=pN,f∫10pN,tdt0≤f≤1