hp40g+.book Page 61 Friday, December 9, 2005 1:03 AM

Tests menu

ASSUME

Use this function to make a hypothesis about a specified

 

argument or variable.

 

Example

 

Typing:

 

ASSUME(X>Y)

sets an assumption that X is greater than Y. In fact, the calculator works only with large not strict relations, and thus ASSUME(X>Y) will actually set the assumption that X

≥Y. (A message will indicate this when you enter an ASSUME function.) Note that X ≥ Y will be stored in the REALASSUME variable. To see the variable, press , select REALASSUME and press .

UNASSUME

Use this function to cancel all previously specified

 

 

assumptions about a particular argument or variable.

 

 

Example

 

 

 

Typing:

 

 

 

UNASSUME(X)

 

 

 

cancels any assumptions made about X. It returns X in the

 

Equation Writer. To see the assumptions, press

,

 

select REALASSUME and press

.

 

>, ≥, <, ≤, ==, ≠

See “Test functions” on page 13-19.

 

 

AND

See “AND” on page 13-19.

 

 

OR

See “OR” on page 13-19.

 

 

NOT

See “NOT” on page 13-19.

 

 

IFTE

See “IFTE” on page 13-19.

 

 

Trig menu

All the functions on this menu are also available on the menu in the Equation Writer. See “TRIG menu” on

page 14-38 for a description of these functions.

Computer Algebra System (CAS)

14-61