Texas Instruments TI-89 Manual

A SERVICE OF

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Programming 605

Note: From the keyboard, you can type:

>= for |

<= for {

/= for ƒ

(To get the / character, press e.)

Boolean Tests

Boolean TestsBoolean Tests

Boolean Tests

Boolean operators let you combine the results of two separate tests.

The Not Function

The Not FunctionThe Not Function

The Not Function

The

not function changes the result of a test from true to false and vice versa. For

example:

Note: If you use not from the Home screen, it is shown as ~ in the history area. For

example,

not x>2 is shown as ~(x>2).

Operator True if: Example

and Both tests are true

a>0 and a{10

or At least one test is true

a{0 or b+c>10

xor One test is true and the

other is false

a+6<b+1 xor c<d

not x>2 is true if

is false if

x

{2

x>2