Texas Instruments TITANIUM TI-89 - Manual (Page 906)

906 Appendix A: Functions and Instructions
≤≤≤≤
¹ µ key
expression1 ≤ expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 ≤ list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 ≤ matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be less
than or equal to expression2 .
Returns false if expression1 is determined to be
greater than expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons
element by element.
See "=" (equal) example.
> 2 Ã key
expression1 > expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 > list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 > matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be
greater than expression2 .
Returns false if expression1 is determined to be
less than or equal to expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons
element by element.
See "=" (equal) example.
≥≥≥≥
¹ ¶ key
expression1 ≥ expression2 ⇒ ⇒ ⇒ ⇒ Boolean expression
list1 ≥ list2 ⇒ ⇒ ⇒ ⇒ Boolean list
matrix1 ≥ matrix2 ⇒ ⇒ ⇒ ⇒ Boolean matrix
Returns true if expression1 is determined to be
greater than or equal to expression2 .
Returns false if expression1 is determined to be
less than expression2 .
Anything else returns a simplified form of the
equation.
For lists and matrices, returns comparisons
element by element.
See "=" (equal) example.
! (factorial) ¥ e key
expression1 !
⇒ ⇒ ⇒ ⇒ expression
list1 ! ⇒ ⇒ ⇒ ⇒ list
matrix1 !
⇒ ⇒ ⇒ ⇒ matrix
Returns the factorial of the argument.
For a list or matrix, returns a list or matrix of
factorials of the elements.
The TI -89 computes a numeric value for only non-
negative whole-number values.
5! ¸ 120
{5,4,3}! ¸ {120 24 6}
[1,2;3,4]!
¸
[
1 2
6 24
]