LEGAL

JUnit 4 Eclipse public License v1 - https://github.com/junit-team/junit
log4j Apache License 2.0  - http://logging.apache.org/log4j/2.x/
symja android GNU GPL v2.1 - https://bitbucket.org/axelclk/symja_android_library/wiki/Home
ShowcaseView Apache License 2.0 - https://github.com/amlcurran/ShowcaseView
mockito MIT License - http://code.google.com/p/mockito/
nineoldandroids Apache License 2.0 - http://nineoldandroids.com/ 
Apache commons math Apache License 2.0 - http://commons.apache.org/proper/commons-math/
Java Algebra system GNU GPL v2 - http://code.google.com/p/java-algebra-system/
google guava under Apache License 2.0 - https://code.google.com/p/guava-libraries/