English: Mathematical non-orientable surface which the boundaries are the trefoil knot in different angles, object is part of the Matemateca (IME/USP) collection.
Português: Superfície não-orientável cujo bordo é o nó trifólio, parte do acervo da Matemateca IME-USP
CC-BY-SA 4.0 (as metadata). Please attribute as Matemateca (IME/USP)/Rodrigo Tetsuo Argenton. This file was published as the result of a partnership between Matemateca (IME/USP), the RIDC NeuroMat and the Wikimedia Community User Group Brasil (Report).
This media was produced by the Matemateca (IME USP). The Matemateca is part of the Institute of Mathematics and Statistics, University of São Paulo, Matemateca IME-USP asks to be cited as shown above. If the photographer or artist name is mentioned, please cite it after the museum's name. If not, cite only the museum.