Logic Keyboard is a layout extension for AnySoftKeyboard (available separately on the Android Market). You need to install AnySoftKeyboard first, then you can install this app to add two new keyboards to it. In AnySoftKeyboard you can then swipe the keyboard to get to them, exactly as you would for any of the other keyboard extensions it supports.The two new keyboards provided by this app are used for typing logic symbols on your Android device. They’re useful to anyone interested in many areas of mathematics including sets and logic systems, including for student use.Logic Keyboard is a free app intended to be an aid to using Android devices for mathematical purposes. No warranty is provided even of merchantability.