Quick Formula Editing

Liii STEM provides a dedicated Math Mode that supports formula editing, numbering, and referencing. It also integrates LEGO symbols and Tab cycling together with shortcuts such as Magic Paste, helping you write formulas more efficiently.

What Is Math Mode

Liii STEM's Math Mode provides a complete environment for mathematical input. All mathematical content should be entered in this mode.

In text mode, the toolbar is mainly used to insert text structures such as chapters, sections, and semantic blocks. In Math Mode, the toolbar provides more mathematical symbols. The image below shows the toolbar in the two modes under the default theme.

Enter Math Mode

Use the mode toolbar

In text mode, click the π button on the mode toolbar to choose inline formulas, single-line formulas, or multi-line formulas.

Note: this π button appears only in text mode. If your cursor is already inside a single-line formula, this π button will not appear. In that case, the shortcuts mentioned below also cannot be used to insert a multi-line formula. At present, multi-line formulas in this situation can only be inserted through the corresponding $\LaTeX$ commands, such as \align and \eqnarray.

Use keyboard shortcuts

• Inline formula: $.

• Single-line formula: Alt + $ / Option + $.

• Multi-line formulas:

Multi-line formulas in \eqnarray format: Alt + & / Option + &.

Multi-line formulas in \align format: Ctrl + $ / Command + $.

Common Questions and Notes

How to physically press these shortcuts

• Inline formula: press Shift + 4 at the same time.

• Single-line formula: hold Alt / Option, then press Shift + 4.

• Multi-line formula in \eqnarray format: hold Alt / Option, then press Shift + 4.

• Multi-line formula in \align format: hold Ctrl / Command, then press Shift + 4.

What if I forget the shortcuts

If you forget a shortcut, go to Insert -> Mathematics -> Inline formula. The shortcut hint is also shown in that menu.

Why does a shortcut stop working

Shortcuts work only when you are using an English input method. If your cursor is already inside a single-line formula, these shortcuts also cannot be used to insert formulas.

Final Rendering

• Inline formula

• Single-line formula

• Multi-line formulas: eqnarray and align use different alignment styles

Multi-line formulas in eqnarray format

Multi-line formulas in align format

Equation Numbering and Referencing

Number equations

In Math Mode, click 123 on the focus toolbar, or use the \eq-number command to number formulas.

Piecewise functions can be numbered either as a whole formula or line by line. If you directly select the formula and click 123 on the focus toolbar, the whole multi-line formula will be numbered.

eqnarray format supports only line-by-line numbering.

align format supports only line-by-line numbering.

Label and reference equations

You can add labels to numbered equations in Liii STEM so that they can be referenced later in the document. For detailed guidance, please refer to the following tutorial:

Cross-Reference and Numbering in Liii STEM