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Re:Show HN: Mathcha – Online Mathematics Editor by yorwba on Sunday August 13, 2017 @03:59AM (#15002022)
This looks really good, but you might want to hire a copy-editor in the future:

Most ~~of~~ symbols are the same in \inline-math and \math-container, but there are ~~one~difference~~ some differences , these symbols below will be displayed in smaller fonts

Additionally, when I copy-pasted this here from your document, it included a bunch of metadata you probably don't want to expose to users. I think there is a way to set different clipboard contents for different MIME types, maybe look into that.

Re:Show HN: Mathcha – Online Mathematics Editor by buiducnha on Sunday August 13, 2017 @04:17AM (#15002064)
With Inline Math (\inline-math), there are some symbols will be displayed smaller (by default) than Display Mode (math-container). This is because I implement it to be the same with LATEX style, maybe most of people dont want that behavior, so may possibly change in future.

Good advice on MIME types, thanks.

Re:Show HN: Mathcha – Online Mathematics Editor by andrewjw on Sunday August 13, 2017 @04:51PM (#15004870)
The comment above with ~~~ was trying to give you grammar help, not content help.