Thomas Beck submitted the
mathbb-one
package.
Version: 1.0 2026-11-04 License: lppl1.3c other-free
Summary description: Blackboard-bold 1 for amssymb’s \mathbb, as a vector font
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mathbb-one makes \mathbb{1} work with amssymb. It prints the 1 from the bbm fonts (the closest match to amssymb's letters) as a vector font, and changes nothing else. Works with pdfLaTeX, LuaLaTeX and XeLaTeX; also defines \Bbbone and ships an OpenType version for unicode-math users.
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The package’s Catalogue entry can be viewed at https://ctan.org/pkg/mathbb-one
The package’s files themselves can be inspected at https://mirrors.ctan.org/fonts/cm/mathbb-one/
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Thanks for the upload.
For the CTAN Team Petra Rübe-Pugliese
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