Editable:


        You can write math expression inside paragraph like this: $x + 1$
        

        Inline formulas can be written with \$ e.g: $c = \pm\sqrt{a^2 + b^2}$
        

        and displayed equations can be written using \$$ e.g: $$\sum_{i=1}^n 2^i$$

Editable empty:

Just an expression (not editable):

% \f is defined as f(#1) using the macro
        \f{x} = \int_{-\infty}^\infty
        \hat \f\xi\,e^{2 \pi i \xi x}
        \,d\xi

Not an expression (not editable):

Yolo I'm formatted but that's not a problem

Above text is formatted as an expression as it does not contain any math expression. We accept this in order to support both inline and paragraph mode.

A single line paragraph (not editable):

You can write math expression inside paragraph like this: $x + 1$

More examples (not editable):

Source: https://tiddlywiki.com/plugins/tiddlywiki/katex/

f(x) = \int_{-\infty}^\infty\hat f(\xi)\,e^{2 \pi i \xi x}\,d\xi


        \frac{1}{\Bigl(\sqrt{\phi \sqrt{5}}-\phi\Bigr) e^{\frac25 \pi}} = 1+\frac{e^{-2\pi}} {1+\frac{e^{-4\pi}} {1+\frac{e^{-6\pi}}
        {1+\frac{e^{-8\pi}} {1+\cdots} } } }


        1 + \frac{q^2}{(1-q)}+\frac{q^6}{(1-q)(1-q^2)}+\cdots = \prod_{j=0}^{\infty}\frac{1}{(1-q^{5j+2})(1-q^{5j+3})}, \quad\quad \text{for
        }\lvert q\rvert<1.