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  2. Mengenlehreuhr - Wikipedia

    en.wikipedia.org/wiki/Mengenlehreuhr

    The clock at its original location in May 1979, displaying 17:54 (5:54pm). The Mengenlehreuhr ( German for " Set Theory Clock") or Berlin-Uhr (" Berlin Clock") is the first public clock in the world that tells the time by means of illuminated, coloured fields, for which it entered the Guinness Book of Records upon its installation on 17 June 1975.

  3. Set theory (music) - Wikipedia

    en.wikipedia.org/wiki/Set_theory_(music)

    The fundamental concept of musical set theory is the (musical) set, which is an unordered collection of pitch classes. [4] More exactly, a pitch-class set is a numerical representation consisting of distinct integers (i.e., without duplicates). [5]

  4. Tone clock - Wikipedia

    en.wikipedia.org/wiki/Tone_Clock

    Hours: the 12 trichordal set-classes, called triads in tone-clock theory. The first hour is therefore IPF 1-1 (in pc-set theory, this would be set-class 3-1 or (012)), while the twelfth hour is IPF 4-4 (in pc-set theory, this would be set-class 3-12 or (048)). In tone-clock theory, the hours are often referred to using Roman numerals — so IV ...

  5. Thorngate's postulate of commensurate complexity - Wikipedia

    en.wikipedia.org/wiki/Thorngate's_postulate_of...

    if research that aims to be general and simple (10-o'clock), results would not be accurate and if research that aims to be general and accurate (2-o'clock), results would not be simple any more. Basically, Weick maintains, that there is a "trade-off" between these three virtues in such a way that only two can be achieved at any given time.

  6. Russell's paradox - Wikipedia

    en.wikipedia.org/wiki/Russell's_paradox

    Further, since set theory was seen as the basis for an axiomatic development of all other branches of mathematics, Russell's paradox threatened the foundations of mathematics as a whole. This motivated a great deal of research around the turn of the 20th century to develop a consistent (contradiction-free) set theory.

  7. Why are clocks set forward in the spring? Thank wars ... - AOL

    www.aol.com/news/why-clocks-set-forward-spring...

    There's been plenty of debate over the practice, but about 70 countries — about 40% of those across the globe — currently use what Americans call daylight saving time. At one point, if riders ...