08:35, 24 December 2019David Eppsteintalkcontribs uploaded File:C. Doris Hellman.jpg(((Non-free use rationale 2 | Description=C. Doris Hellman | Author=unknown | Source=((citation|title=Éloge: C. Doris Hellman, August 28, 1910 – March 28, 1973|first=Edward|last=Rosen|authorlink=Edward Rosen|journal=Isis|volume=66|issue=4|date=December 1975|pages=561–562|jstor=228927|doi=10.1086/351513)) | Publication= | Article=C. Doris Hellman | Purpose=To depict the subject in a biographical article about her | Replaceability=Subject is deceased and no free images of...)
07:30, 7 December 2006David Eppsteintalkcontribs uploaded File:7x-torus.svg(A partition of the torus into seven mutually adjacent regions, requiring seven colors. The torus is shown unrolled onto a square; points on the top edge of the square should be thought of as connected to the corresponding points on the bottom edge of the)