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Randy D
Walt O'Reagun
Discussion » Questions » Math » What is your favourite equation?

What is your favourite equation?

Posted - June 10, 2019


  • Certainly not the Pythagorean theorem. Anything concerning triangles has only gotten me into trouble :/
      June 10, 2019 2:38 PM MDT

  • 31711
    Yeah...I'll stick with squares.
      June 10, 2019 2:40 PM MDT

  • I'll stick with lines because they can go forever. 
      June 10, 2019 2:42 PM MDT

  • But, but, but the magnitude of vectors 
      June 10, 2019 5:28 PM MDT

  • I suppose I could use a sense of direction.
      June 10, 2019 6:08 PM MDT

  • 6219
    None of them and that was always the problem.
      June 10, 2019 2:44 PM MDT

  • 14905
    Pies R Square, always seems to bode well for me...:)
      June 10, 2019 3:38 PM MDT

  • 16227

    "Let X = X "     Laurie Anderson

    I love this!

    This post was edited by WelbyQuentin at June 11, 2019 5:34 AM MDT
      June 10, 2019 6:13 PM MDT

  • 6.62607015×10−34 J⋅s
      June 10, 2019 6:19 PM MDT

  • But can I ask, a kilo of what?
      June 10, 2019 6:38 PM MDT

  • Anything, or everything,  even nothing if we want to go down that rabbit hole.
      June 10, 2019 6:43 PM MDT

  • I love rabbit holes.

    I'm sure I'm about to get a warning, but sometimes I can't help myself. It's medical condition, I swear, lick a tic.
    This post was edited by Just Asking at June 13, 2019 9:12 AM MDT
      June 10, 2019 6:54 PM MDT

  • 46231
    Energy equals matter times the speed of light squared.
      June 11, 2019 12:06 AM MDT

  • 31711
      June 11, 2019 5:35 AM MDT

  • 2183
    I recognise a few in that table, and I use a few from time to time, but I think my "favourite" if I could be said to have one is printed round a coffee-mug that looks as if it was from a museum gift-shop or some-such.

    I'll try to reproduce it here, but it was not easy to transcribe as my edition of Word does not include the Equation Editor.... 


    ʃdxdydzUδV + ʃU dV/dw - 4 πU’’ = ʃdxdydzVδU + ʃV dU/dw - 4 πV’ ….. (3’)

    I have no idea what it does, still less any idea how to calculate it if given the rest of the equations, purpose and values. I know only that it was quoted from the work of the English mathematician George Green, alongside a picture of a windmill commemorating his parents' milling business!

    I'll hazard a guess...

    I think it means the sum of a certain two three-dimensional integrals and a negative pi term, is identical to the sum of a sort of mirror image of each of those three terms. 

    So, if V = Volume, U might = area (but why not use A?); and Pi suggests revolution. I do not know what the two other Greek letters mean here.

    So the work from which this is taken may describe the values and mutual relationships of surface-areas and volumes of solids generated by rotating complex but numerically defined curves. Just my guess!

    Why "favourite"? Only because it intrigues me and is so far beyond any maths I could possibly learn!

      May 21, 2020 4:48 PM MDT