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Submit to the gallery
Formulas in the gallery are files in a public GitHub repository, added by pull request. Fill this in and GitHub opens with the file ready: it makes your own copy and the pull request for you (you need a free GitHub account). A maintainer checks it before it appears.
gallery/.psi
This one is too long to hand to GitHub in a link: copy the file, then open GitHub, name the file as above and paste it in.
The formula
Written in Psi, OpenDMD’s formula language: how formulas work.
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