Frequently Asked Questions (FAQ)

Q: Why does continuous input of xy appear in upright font instead of italic?

A: In Liii STEM, continuous input of xy is interpreted as an operator, therefore it appears in upright font (this behavior is equivalent to \mathrm{xy} in LaTeX). If your actual meaning is x multiplied by y, you can add an extra space between xy (a stricter approach is to input a space followed by Tab, which inputs an invisible multiplication symbol).

Q: How to input subscript for lim

A: Enter Math Mode and input lim, then input _ to add content below the limit lim. Video tutorial: Liii STEM: How to Input Limits

Q: How to adjust the display style of mathematical formulas

A: The display style for inline formulas is enabled by default, while for displayed formulas it is disabled by default. You can select the formula and adjust it through the Toolbar: Format → Display style.

Q: Can invoices be issued?

A: Yes, after payment, please contact customer service and provide invoice header information. We will have dedicated personnel issue the invoice for you.

Q: Why am I not receiving email verification codes?

A: If you haven't received the email verification code for a long time, please check your spam folder first. Using foreign email addresses may result in not receiving verification codes (such as Gmail).

Q: What is the relationship between TeXmacs, Mogan STEM, and Liii STEM?

A: Mogan STEM (Community Edition) is developed based on TeXmacs 2.1.4. Liii STEM (Commercial Edition) adds built-in AI and formula recognition features on top of Mogan STEM.

Q: Can commutative diagrams be drawn?

A: Yes, enter Math Mode and use the Toolbar: Insert → Image → Commutative diagram to draw commutative diagrams. Video tutorial: Liii STEM: The World's Fastest Method for Drawing Commutative Diagrams