HP 40gs Manual de usuario descargar pdf (Pagina 243)

100

101

Computer Algebra System (CAS) 14-61

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.

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