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- Math Problems for children from 5 to 15 (2004) [pdf] https://www.imaginary.org/sites/default/files/taskbook_arnold_en_0.pdf 318 comments
- Place for Open and Interactive Mathematics https://imaginary.org/ 3 comments
- The Mathematics of Music [pdf] https://imaginary.org/sites/default/files/20190911-lala-booklet-v0.4-web-text.pdf 32 comments
- Snapshots of modern mathematics from Oberwolfach https://imaginary.org/snapshots 4 comments
- The Mathematics of Music [pdf] https://imaginary.org/sites/default/files/20190911-lala-booklet-v0.4-web-text.pdf 5 comments math
- V I Arnold: Problems for Children from 5 to 15 http://imaginary.org/sites/default/files/taskbook_arnold_en_0.pdf 21 comments math