Markdown, with the arithmetic in it
Documents that compute.
Write in plain Markdown, and put small live programs in it: sliders, tables and charts that work the numbers out as you read. Keep a document private, share it with the people you choose, or publish it with a link. Edit it together, and see each other's changes as they happen.
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```bib
let units = slider("Units", 1, 10, value: 3)
for v in data.vendors {
stat(v.name, v.price * units, unit: "EUR")
}
```