Quick Formula Editing

Liii STEM supports formula editing, numbering, and referencing. We also support efficient input methods for math, such as LEGO symbols, Tab cycling, and magic paste, to speed up your math writing!

1. Introduction to math mode

All math-related content should be entered in math_ mode_.

• Use the $ shortcut to enter math mode.

In text mode, the buttons in the mode toolbar are primarily for inserting various text elements, such as "Sections". In contrast, in math mode, the buttons in the mode toolbar offer a wide range of mathematical symbols, as shown in the picture below:

2. Entering math mode

Method 1: Mode Toolbar Button

In Text Mode, click the π button on the mode toolbar to choose an environment provided by the math mode (discussed in the next section), as shown in the picture below:

Method 2: Keyboard Shortcuts

• Inline Formula: $
• Single-line Formula: Alt+$
• Multi-line Formula in \eqnarray:Alt+&
• Multi-line Formula in \align :Ctrl+$

These shortcuts are only active in the English input method.

3. Environments provided by math mode

• Inline Formula:

• Single-line Formula (Displayed Formula):

• Multi-line Formula (Alignment Equations):

Liii STEM provides two environments for multi-line formulas: \eqnarray and \align.

eqnarray Environment:

• Menu: Insert → Mathematics → Several equations
• Text Mode Toolbar: Click the π button → Several equations
• Keyboard Shortcut: Alt + &

align Environment:

• Type \align and press Enter to insert the align formula environment:

4. Formula Numbering and Referencing

In math mode, you can number a formula by either:

• Clicking the 123 button on the focus toolbar.
• Using the \eq-number and pressing Enter.

Among these:

1. Piecewise functions \choice can be numbered either as a whole or by line. To number individual lines within a multi-line formula separately, you need to type the command \eq-number after the specific line and then press Enter, as shown below:

2. Formulas in eqnarray and align environments only support line-by-line numbering, as shown below:

   • eqnarray Format:
   • align Format:

Formula Labeling

You can label any numbered formula in Liii STEM for subsequent reference in your document. To meet this need, please refer to: "Cross-Referencing".

5. Math input method: Lego symbol and tab cycling

We provide a new, simple, and easy-to-learn formula input method. With just a week of practice, your math input efficiency can rival handwriting.

Lego Symbols

New characters can be generated by combining existing ones. The combination rules follow an intuitive, visual design for easy memorization and convenient writing. For example:

< and > indicate direction.

@ represents a circle.

Symbol	**Liii STEM Lego Symbols**
→	"-" “>"
⇏	“=" “>" “/"
∞	“@" “@"
∅	“@" “/"
ℝ	“R" “R"
≐	“.” “="
...

Tab Cycling

In math mode, after entering any character, you can cycle through its visually similar symbols (e.g., A and ∀) or phonetically similar Greek letters (e.g., a and α) by pressing the Tab key.

Press Shift + Tab to cycle in reverse.

Example: Type A, then press Tab twice to get ∀.

Symbols	Liii STEM Tab Cycling
⟨	"<" "Tab"
⊏	“<" "Tab"
α	"a" "Tab"
ε	"e" "Tab"
∀	"A" "Tab"
∃	"E" "Tab"
...

Magic Paste

We support lossless copying of formulas from the web into Liii STEM, use Ctrl/Cmd+ C or right-click and select "Copy," then paste it directly into a Liii STEM text environment.

Please do not use the built-in copy button provided in the LLM's output interface. For detailed usage instructions, please refer to "Magic Paste" .

6. Handwritten recognition and LLMs auto-generated contents

Liii STEM has built-in LLMs, and all content it generates is automatically typeset into Liii STEM.

1. Text recognition

2. Handwritten Formula Recognition

For detailed usage instructions, please refer to "AI Features".

7. Shortcut Query and Memorization Guide

When working in Liii STEM, mastering keyboard shortcuts can significantly enhance your efficiency. To assist with this, we provide the following methods for quick reference and easy memorization:

1. Hover for Tooltips: Put your cursor over any symbol in the toolbar to see its associated shortcut.

2. Official Documentation: A list of all keyboard shortcuts is available in the official guide: "Liii STEM Keyboard Shortcuts" (PDF document included).
3. "Guessing": Use the logic of Building-block Symbols and Tab Cycling to intuitively "guess" shortcuts. For a video tutorial, you can refer to the Bilibili video: "Ultra-Fast Formula Editing".