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$\begingroup$ I beat you by a hair. +1 for providing an alternative. Another is: {a, a^2, a^3} /. a : Except[List | _List]^(n_: 1) :> b^(2 n) $\endgroup$

Mr.Wizard
– Mr.Wizard

2013-01-09 10:42:59 +00:00
Commented Jan 9, 2013 at 10:42

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Correct minor typos or mistakes
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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**
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>
MathJax equations $\sin^2 \theta$

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