Thank you for your interest in this app.

【overview】

This app is a math calculation app, a so-called scientific calculator app (something like).

Python's SymPy
For drawing graphs, Python's Matplotlib
is using

SymPy and Matplotlib are very high-performance and multi-functional libraries.
This calculator app uses only very simple functions of SymPy and Matplotlib.
It is not at all a high-performance and multi-functional calculator app like popular similar apps.
Thank you for your understanding.

As for the positioning of this calculator app,
It's more functional than the simple calculator app that comes pre-installed on smartphones and tablets.
It doesn't feel like a calculator app with high functionality and multiple functions like popular similar apps.
It is a middle-range calculator app located in the middle of them.

This calculator app is a calculation level that appears in junior high school mathematics and high school mathematics textbooks.
We are aiming for an application that is an auxiliary tool for calculation.
Have obeyed
・There are many things that can be done with simple calculations in junior high and high school mathematics.
・It is often impossible to calculate university mathematics and specialized mathematics
I would appreciate it if you could include it in advance.

*With the stance that it doesn't matter if you can't do calculations in university mathematics and specialized mathematics
We are creating this calculator app, so we appreciate your understanding.

【feature】

(1) Uppercase and lowercase letters of the alphabet and lowercase Greek letters can be used.
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
αβγδεζηθικλμνξοπρςστυφχψω

(2) Pi "π", imaginary unit "i", and Napier's number "e" can be used.
Mathematical constants and physical constants other than the above are not provided.

(3) Multiplication "*" and exponent "^" can be omitted for monomial expressions.
For example, "a^2*b^3*c^4" is OK just by entering "a2b3c4".

- - - - -

【menu】

(1) Polynomial function
Expansion/factorization
　Equations/simultaneous equations
Inequalities/simultaneous inequalities

(2) Trigonometric functions sin, cos, tan
(3) Exponential function exp
(4) Logarithmic functions log, log10
(5) Substitution
(6) Organize by
(7) Differential d/dx
(8) Integral, indefinite integral, definite integral ∫
(9) quotient/remainder
(10) Congruence ceremony
(11) integer solution
(12) Inverse function
(13) Limit, left limit, right limit lim
(14) Prime numbers/prime factorization
(15) Sequence sum Σ

- - - - -

[How to use]

Basically, I try to be able to use it intuitively without reading the manual at all.
That said, there may still be some things that are difficult to understand how to use.
It's very simple, but here it is:

(1) Simultaneous equations

・When listing expressions, separate them with a comma ",".
(Example) 2x+3y=4, 5x+6y=7

・You cannot enter in the form of "A=B=C".
Please break it down into "A=B, B=C" etc. and enter.

(2) Matrix

・When using a matrix, first press the parentheses (　).
・Separate matrix elements with commas ",".
・Enter two commas ",," for a line break in the matrix.

(Example) Matrix with 2 rows and 2 columns
( 1 2
34)
if
"(1, 2,, 3, 4)"
Please enter

(3) Inequality sign ≤ ≥

・Please enter "<=" for the inequality sign "　≦　".
・Enter ">=" for the inequality sign "≧".

- - - - -

[Acknowledgments]

This app uses the following.
I would like to express my gratitude.

(1) SymPy
https://www.sympy.org/en/index.html
Python algebra library

(2) Matplotlib
https://matplotlib.org/
Visualization with Python

(3) Chaquopy
https://chaquo.com/chaquopy/
Python SDK for Android

(4) KaTeX
https://github.com/lingarajsankaravelu/Katex
formula typesetting

(5) Font Awesome
https://fontawesome.com/
icon font

(in no particular order)

- - - - -

【lastly】

This calculator app is intended for Japanese users.
I'm very sorry, but there are no plans to expand to multiple languages.

We hope that you will enjoy using it for a long time.
Sincerely.