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+====== Kinematical Groups ======
+<tabbox Intuitive>
+<note tip>
+Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.
+</note>
+<tabbox Concrete>
+  * For a nice introduction, see Section 3.4.5 "Kinematical groups and their mutual contractions" in the book Symmetries in Fundamental Physics by Sundermeier.
+  * See also Section 4 in [[https://projecteuclid.org/euclid.bams/1183533964|Missed opportunities]] by Freeman J. Dyson
+<tabbox Abstract>
+<note tip>
+The motto in this section is: //the higher the level of abstraction, the better//.
+</note>
+<tabbox Why is it interesting?>
+A proper understanding of possible kinematical groups helps us to understand why spacetime symmetry groups are possible.
+<blockquote>Suppose that somebody had been bold enough in 1908 to take [the kinematical groups] seriously. He would have correctly predicted the expansion of the
+universe twenty years before it was discovered observationally by Hubble.
+More importantly, he would have been led to postulate the curvature of
+space-time, and so he would have considerably eased the path which led
+to general relativity. <cite>[[https://projecteuclid.org/euclid.bams/1183533964|Missed opportunities]] by Freeman J. Dyson</cite></blockquote>
+/*<tabbox FAQ>*/
+/*<tabbox History>*/
+</tabbox>