Hello,
Is there a way to show Feynman/slash notation? I should get something like
Instead i get <slashed|p>
Feynman/slash notation
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Welcome to the forum!
In TeXmacs, you could input this kind of slash with Insert → Negation in math mode. Provided alongside the menu item, there should be a reminder of its keyboard shortcut, which is e.g., Ctrl + N on my MacBook. Furthermore, the corresponding macro is \not.
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After a bit of digging I found a simple macro that does the trick without requiring any library: \newcommand{\fsl}[1]{{#1}\!\!\!/}.
Use it as \fsl{arg1} and it should behave similarly to the \slashed package.