Warning! you don't need internet to use this app, preferece used only for check conection button. Why I need this app? This app can be useful to you, if you are an Algebra teacher, student, pupil or simply using algebra in your daily life, so DTW means Don't trouble with, this app help you do not have 'em What can I calculate with this app? Equations: -Quadratic equation -Qubic equation -Linear system equations -Differential equation 2nd order -Differential equation 3rd order Calculation -Integrals -Logarithms -Roots & powers -SCM и HCF Matrix: -Addition/substraction -Multiplication -Determinant -Determinant throgh expansion -Inverse matrix -Transportation -Converting to triangular view What I can use in lite version? Equations: -Quadratic equation Calculation -Logarithms -Roots & powers Matrix: -Addition/substraction Do you have more apps in this series? - In august we're planning to realise DTW Geometry in Russian, a week later will be realised english version.