## overview

This is a work-in-progress demonstrator of a Mathematical Expression Recognizer (Last update: September, 2016).

The recognition engine is based on SESHAT, an open-source system for recognizing handwritten math expressions.

## instructions

1. Write an expression on the 'draw here' area.
2. Click on the 'send' link to translate it to a LaTeX equation.

## accepted expressions

At present, the system is trained to recognize more than 100 symbols:
a-z A-Z 0-9 < > ≤ ≥ = ≠ - + ± × ! | . , ... ( ) [ ] { } ′ → ∃ ∀ ∈ ∫ √ ∞ α β Δ γ λ μ φ π σ Σ ∏ θ lim log cos sin tan

The system expects complete equations, hence, an expression like "$$2+2=$$" would not be recognized because an equal sign requires a right-hand operator (e.g. "$$2+2=4$$").

Most of math expressions are accepted, containing subscripts ($$a_1$$), superscripts ($$x^2$$), fractions ($$\displaystyle\frac{a+b}{c}$$), square roots ($$\sqrt{\pi^2}$$ or $$\sqrt[3]{4y}$$), integral ($$\displaystyle\int_a^b x$$), summation ($$\displaystyle\sum_{i=0}^n x+i$$), limits ($$\displaystyle\lim_{x \rightarrow \infty}\frac{1}{x}$$), functions ($$\sin^2 \alpha$$), ...

On the other hand, matrices $$\displaystyle\left(\begin{matrix} 1 & 2 \\ 3 & 4 \end{matrix}\right)$$, left scripts ($${}_nC_m$$) or piecewise functions ($$f(n) = \left\{ \begin{array}{l l} n & \quad n \geq 0\\ 1-n & \quad n < 0 \end{array} \right.$$) are not recognized yet.

It is expected to increase the number of symbols and accepted expressions in the short-term, as well as improving the recognition system and the expression accepted.