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This old question just got bumped to the home page. And this answer has so many things wrong with it, I hardly know where to begin. First, \displaystyle and \textstyle are declarations. Their effect lasts until the end of the current group, end of formula, or next explicit style change. So redefining \sum in the way of this answer is quite counterproductive. Look to this answer for a much better explanation. And read the comments on the question above for the typographical issues and why this is generally a bad idea.

Harald Hanche-Olsen
– Harald Hanche-Olsen

2018-07-29 19:45:10 +00:00
Commented Jul 29, 2018 at 19:45

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Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

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