Tests Menu; Trig Menu - HP 40gs User Manual

Tests menu

ASSUME
UNASSUME
≠
≥ ≤, ==,
>, , <,
AND
OR
NOT
IFTE

Trig menu

Computer Algebra System (CAS)
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
REALASSUME variable. To see the variable, press
, select REALASSUME and press
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.
See "AND" on page 13-19.
See "OR" on page 13-19.
See "NOT" on page 13-19.
See "IFTE" on page 13-19.
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.
≥
Y will be stored in the
.
.
,
14-61