Old Hollywood: Lewis sensationally revealed in her 1994 memoir that she was conceived in 1935 when Loretta Young, 22, and the married Clark Gable, 34, were shooting The Call of the Wild. Secret: Loretta Young is pictured with Judy Lewis in 1944, who did not know for years who her father was.
The sigma symbol provides the character used to denote the sum of an equation in mathematics. You can create a sigma sign by accessing the Character Palette, using a keyboard shortcut or by using the Special Characters menu in your current application.
A shorter way of writing this is to let ur represent the general term of the sequence and put Xn r=1 ur. Here, the symbol Î£ is the Greek capital letter Sigma corresponding to our letter âSâ, and refers to the initial letter of the word âSumâ. So this expression means the sum of all the terms ur where r takes the values from 1 to n. We can also write Xb r=a ur to mean the sum of all the terms ur where r takes the values from a to b. In such a sum, a is called the lower limit and b the upper limit. Key Point The sum u1 +u2 +u3 +...+un is written in sigma notation as Xn r=1 ur. c mathcentre July 18, 2005 2