update readme

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mattdesl
2015-07-02 18:00:02 -04:00
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@@ -738,7 +738,7 @@ function fPrime (x) {
Multiple prime symbols can be used to describe the second derivative *ƒ′′* and third derivative *ƒ′′′*. After this, authors typically express higher orders with roman numerals *ƒ*<sup>IV</sup> or superscript numbers *ƒ*<sup>(n)</sup>.
## lines & arrows
## arrows
We have already seen some arrows in the [function notation](#function-notation) section. Here are a few other variations.