GeoGebra Augmented Reality allows users to input many domain restrictions on multivariable functions! [br][br]Note the equations of the 2 surfaces shown in the screencast below (at bottom of screen). [br][br]The [b][color=#1e84cc]blue surface is a paraboloid of revolution[/color][/b] [math]z=x^2+y^2[/math] for which [math]\left|y\right|\ge1[/math]. [br]The [b][color=#ff00ff]pink surface is part of a parabolic sheet[/color][/b] [math]z=x^2+1[/math] for which [math]\left|x\right|\le1[/math]. [br][br]Put together, these 2 surfaces are used to model the coffee filter shown at the end of this screencast. [br][br]You can enter AS MANY DOMAIN RESTRICTIONS within GeoGebra Augmented Reality as you'd like. Simply put a comma "," after each one.