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Improved math alignment documentation (#2505)

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Curtis Decker 2023-11-02 05:47:21 -04:00 committed by GitHub
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docs/reference/categories.yml
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@ -51,6 +51,26 @@ math: |
&= (n(n+1)) / 2 $
```
When formulas include multiple _alignment points_ ('&'), this creates blocks
of "right aligned/left aligned" columns and positions them by equally dividing
the blank space remaining between the blocks. So, in the example
below, in "a &= b", the "a" is in a right aligned column while "=b" is left aligned.
In "a &= b & text", text is in a right aligned column, but in the next line, "a &= b && text",
text is in a left aligned column because "&&" is two alignment points in a row, equivalent to
"& <no code here> &". "& &" and "&&" behave exactly the same way, and adding additional alignment
points simply alternates between right aligned/left aligned. The additional lines in the example
below demonstrate this point.
```example
$ a &= b \
a &= b & "text" \
a &= b && "text" \
(3x + y) / 7 &= 9 && "given" \
3x + y &= 63 & "multiply by 7" \
3x &= 63 - y && "subtract y" \
x &= 21 - y/3 & "divide by 3" \ $
```
Math mode supports special function calls without the hash prefix. In these
"math calls", the argument list works a little differently than in code: