Sort the Moodle Gradebook Using Groups 

  1. On your course page, select the Course Management button (black gear icon Course Management button (black background, white gear icon), top right). Under Course Settings, click Edit course settings. The Edit course settings page will open.
  2. Click the Groups heading to view and adjust group settings.
  3. From the Group mode drop-down menu, select either Separate groups or Visible groups.
    Note: It does not matter which mode you use for viewing the Gradebook by group, but your choice will become the default when adding new activities to the course. For a description of both of these modes, refer to Group Modes in Moodle.
  4. Scroll down to the bottom of the page and click Save changes.

If you need to create your own custom groups, see Create & Modify Groups in Moodle.

View Grades for Specific Groups or Sections

To view grades for specific groups or sections in your course:

  1. On your course page, select the Course Management button (black gear icon Course Management button (black background, white gear icon), top right). Under Grading, click Grader report. The Grader report page will open.
  2. At the top of the Grader report, from the Separate/Visible groups drop-down menu (left), select a group name. Your gradebook will refresh to show only the students in that group.
    Note: You will not see this menu unless group mode is enabled for your course (see Enable Group Mode above).
  3. To return to showing all students, select All participants from the Separate/Visible groups drop-down menu.

 

Source: Sort the Moodle Gradebook Using Groups | UMass Amherst Information Technology | UMass Amherst

Évariste Galois

Évariste Galois (/ɡælˈwɑː/; French: [evaʁist ɡalwa]; 25 October 1811 – 31 May 1832) was a French mathematician and political activist. While still in his teens, he was able to determine a necessary and sufficient condition for a polynomial to be solvable by radicals, thereby solving a problem standing for 350 years. His work laid the foundations for Galois theory and group theory, two major branches of abstract algebra, and the subfield of Galois connections. He died at age 20 from wounds suffered in a duel.

https://en.wikipedia.org/wiki/%C3%89variste_Galois

Russell’s paradox

In the foundations of mathematics, Russell’s paradox (also known as Russell’s antinomy), discovered by Bertrand Russell in 1901, showed that some attempted formalizations of the naïve set theory created by Georg Cantor led to a contradiction. The same paradox had been discovered in 1899 by Ernst Zermelo but he did not publish the idea, which remained known only to David Hilbert, Edmund Husserl, and other members of the University of Göttingen. At the end of the 1890s Cantor himself had already realized that his definition would lead to a contradiction, which he told Hilbert and Richard Dedekind by letter.

According to naive set theory, any definable collection is a set. Let R be the set of all sets that are not members of themselves. If R is not a member of itself, then its definition dictates that it must contain itself, and if it contains itself, then it contradicts its own definition as the set of all sets that are not members of themselves.

https://en.wikipedia.org/wiki/Russell%27s_paradox