Difference between revisions of "Inequalities"
(added "e.g. in x", because the example refers to a point on the x-axis) |
|||
| Line 6: | Line 6: | ||
* inequalities linear in one variable, e.g. ''2x > sin(y)'' or ''y < sqrt(x)''. | * inequalities linear in one variable, e.g. ''2x > sin(y)'' or ''y < sqrt(x)''. | ||
For inequality sign you can use <, >, ≤, ≥. The Symbols <= and => also valid. | For inequality sign you can use <, >, ≤, ≥. The Symbols <= and => also valid. | ||
| + | Conjunction and disjunction are also supported for inequalities, e.g. ''(x>y)&&(x+y<3)'' can be drawn. | ||
| + | |||
| + | In order to show the solution of an inequality as one or more intervals on the x axis, select the ''Show on x-axis'' option in the ''Style'' tab of the [[Properties_Dialog| Properties dialog]] of the inequality . | ||
Inequalities are similar to functions, you can test whether ''x'' and ''y'' satisfy inequality ''a'' by typing ''a(x,y)'' in the [[Input Bar]], also when ''A'' is a point, syntax ''a(A)'' is valid. A point can be restricted to the region given by inequality using [[PointIn Command]]. For inequality ''b'' in one variable, e.g. in ''x'', Point[b] yields a point restricted to the part of x-axis which satisfies inequality ''b''. | Inequalities are similar to functions, you can test whether ''x'' and ''y'' satisfy inequality ''a'' by typing ''a(x,y)'' in the [[Input Bar]], also when ''A'' is a point, syntax ''a(A)'' is valid. A point can be restricted to the region given by inequality using [[PointIn Command]]. For inequality ''b'' in one variable, e.g. in ''x'', Point[b] yields a point restricted to the part of x-axis which satisfies inequality ''b''. | ||
| − | |||
| − | |||
Revision as of 11:57, 27 December 2011
GeoGebra supports inequalities in one or two variables. There are no limitations for inequalities to appear in Algebra View, but only specific inequalities can be drawn in Graphics View:
- polynomial inequalities in one variable, e.g. x^3 > x + 1 or y^2>y,
- quadratic inequalities in two variables, e.g. x^2 + y^2 + x*y ≤ 4,
- inequalities linear in one variable, e.g. 2x > sin(y) or y < sqrt(x).
For inequality sign you can use <, >, ≤, ≥. The Symbols <= and => also valid. Conjunction and disjunction are also supported for inequalities, e.g. (x>y)&&(x+y<3) can be drawn.
In order to show the solution of an inequality as one or more intervals on the x axis, select the Show on x-axis option in the Style tab of the Properties dialog of the inequality .
Inequalities are similar to functions, you can test whether x and y satisfy inequality a by typing a(x,y) in the Input Bar, also when A is a point, syntax a(A) is valid. A point can be restricted to the region given by inequality using PointIn Command. For inequality b in one variable, e.g. in x, Point[b] yields a point restricted to the part of x-axis which satisfies inequality b.
