運算式 22: polygon left parenthesis, "G" , right parenthesispolygonG
22
運算式 23: "l" Subscript, "i" "n" "e" , Baseline equals left parenthesis, 1 minus "t" , right parenthesis "G" left bracket, "i" , right bracket plus "t" "G" left bracket, "i" plus 1 , right bracket for "i" equals left bracket, 1... "G" .length minus 1 , right bracketline=1−tGi+tGi+1fori=1...G.length−1
