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$\begingroup$ This answer reads like "it's hard because it is, alright?!" Also there are plenty of quantum systems we can simulate to arbitrarily high precision using classical computers. $\endgroup$
– wsc
Commented Feb 17, 2011 at 23:28

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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**
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>
MathJax equations $\sin^2 \theta$

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