A pile of books on a shelf in the middle of a tall desk. Kreyszig's Advanced Engineering Mathematics is on top.
https://media.mathstodon.xyz/media_attachments/files/113/860/673/490/114/723/original/b70996caa48c50ce.jpg
When I got a proper stand, Erwin Kreyszig thought he could finally retire after a decade underneath my PC monitor.
But no! I've brought him out of retirement to serve as a counterweight for my 3D printer on this wobbly table.
GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.
All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.