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#recmath — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #recmath, aggregated by home.social.

  1. Colin the Mathmo @[email protected] ·

    Friday was the equinox, at 14:46 GMT. I didn't get the time, but yesterday, March 21st, I went out to measure our latitude.

    I did so on the surrounds of the Port Sunlight Analemmatic Sundial, which seemed appropriate:

    sundialsoc.org.uk/wp_bridol/pa

    I'll write up the technique and do the error analysis later, but with a stick, and director's chair, about 10 pennies, a length of ball chain, and a tape measure, I got a latitude of:

    53.343891584 degrees.

    Check the page above to see their official value.

    I'm fairly pleased with that.

    #RecMath #RecMaths #Astronomy #Equinox

    #equinox #astronomy #recmaths #recmath
  2. Colin the Mathmo @[email protected] ·
    CW: Puzzle included ... no spoilers please

    A friend has sent me an interesting meta-puzzle, but we need to start with the first one.

    Attached is a black and white figure divided into four regions. That challenge is to divide the white regions into 2, 3, 4, and 5 congruent pieces.

    More explicitly, one of the white regions will be subdivided into 2 congruent regions. Another into 3, and so on.

    Can you find a solution?

    The second phase will follow later, but I think this is interesting enough in its own right.

    Please put solutions and spoilers behind a CW.

    PS: Classical methods and constructions only. We're in Puzzle World, not Crypto World.

    #RecMaths #RecMath #Math #Maths #MathsPuzzle #MathPuzzle #Geometry #GeometryPuzzle

    #geometrypuzzle #geometry #mathpuzzle #mathspuzzle #maths #math
  3. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    Sabetta Matsumoto:
    Bending Seams - How to Create Couture Curves

    youtube.com/watch?v=vMa6RIi42L

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)
    Please share!

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  4. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    Bjoern Muetzel - Apollonian Dream

    youtube.com/watch?v=m9PNxh3cEw

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  5. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    Spandan Bandyopadhyay:
    The Egg Sandwich Problem

    youtube.com/watch?v=vLUBX3q38o

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  6. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    George Hart, Abraham Sharp and the "Sharpohedron"

    youtube.com/watch?v=0K_0vMrZBj

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  7. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    Tanya Khovanova: My Favorite Math Jokes

    youtube.com/watch?v=zNQLCR0yz2

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  8. Colin the Mathmo @[email protected] ·

    We continue the series of videos of #G4G15 :

    Robin Houston:
    Polyhedra Whose Faces Meet at Right-Angles Except on One Edge

    youtube.com/watch?v=eru0lAuqLz

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  9. Colin the Mathmo @[email protected] ·

    It's Maths Week England !!!!

    mathsweekengland.co.uk/

    #MWE2024 #MWE24 #MathsToday #MathsChat #MathsEd

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mwe2024 #mwe24 #mathedchat #mathed #mtbos #recmath
  10. Colin the Mathmo @[email protected] ·

    Continuing the series of videos of #G4G15 :

    Scott Vorthmann: The Virtual Fifty-Nine Icosahedra

    youtube.com/watch?v=NP4PN1tgGv

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  11. Colin the Mathmo @[email protected] ·

    We continue the series of videos of #G4G15 :

    This is quite simply astonishing:

    Bob Hearn:
    The Magnetic Fifty-Nine Icosahedra

    youtube.com/watch?v=pxsT-uavzu

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  12. Colin the Mathmo @[email protected] ·

    We continue the series of videos of #G4G15 :

    Greg Whitehead:
    Nerd Sniped by the Hat Tile

    youtube.com/watch?v=paYj4hEIsx

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  13. Colin the Mathmo @[email protected] ·

    We continue the series of videos of #G4G15 :

    Amina Buhler-Allen:
    Hyperspace Heroes 1: Odd Bedfellows

    youtube.com/watch?v=7Hc9cHwtcQ

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  14. Colin the Mathmo @[email protected] ·

    Chaim Goodman-Strauss:
    The Hat Aperiodic Monotile

    youtube.com/watch?v=PZw2lFws5o

    Video from #G4G15 ... there's some gorgeous stuff here.

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  15. Colin the Mathmo @[email protected] ·

    Eric Bates: Passing the Spark

    Why do some people seem so natural on camera, while the rest of us feel awkward and inarticulate? This talk delves into the art of speaking to a camera and sharing your skills online...

    youtube.com/watch?v=RWgs7bcpcJ

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  16. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    John Winston Garth: Cellular Auto-mon

    youtube.com/watch?v=b_VR33eICo

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  17. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    Carolyn Yackel:
    Depicting Catalan Solids on Temari Balls

    youtube.com/watch?v=FQLdstg4Ti

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  18. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    Roy Leban:

    Markov Algorithms and Life
    youtube.com/watch?v=ieQdpBgt4D

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  19. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    Tom Rokicki:

    The Speed of Light in the Game of Life

    youtube.com/watch?v=AWDCNCszn-

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  20. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    David Michael Greene:
    How Many Gliders Do You Really Need?

    youtube.com/watch?v=W9ZR_4u38a

    Soon to be on the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  21. Colin the Mathmo @[email protected] ·

    Another video from #G4G15 :

    Alvy Ray Smith:
    What Do the Theory of Computing and the Movies have in Common?

    youtube.com/watch?v=CbXlg3GeIb

    From the playlist:

    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:

    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  22. Colin the Mathmo @[email protected] ·

    Another video from #G4G15 :

    Jorge Nuno Silva:
    Lewis Carroll's Game of Logic
    youtube.com/watch?v=n6HZe4SIR6

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  23. Colin the Mathmo @[email protected] ·

    Next video from #G4G15 :

    Audrey Nasar:
    Symmetry Card Game
    youtube.com/watch?v=mWjUQKoO-O

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  24. Colin the Mathmo @[email protected] ·

    Next video from #G4G15 :

    Jim Propp:
    Industrious Dice, or, Pip-Pip Hooray!
    youtube.com/watch?v=dLFr1SqvkQ

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  25. Colin the Mathmo @[email protected] ·

    Next video from #G4G15 :

    Jeanette Shakalli:
    FUNDAPROMAT: A Free Source for Math Enthusiasts
    youtube.com/watch?v=pRS-iqJ1-1

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  26. Colin the Mathmo @[email protected] ·

    Another video from #G4G15 :

    John Harris:
    Puzzle Variations from a Rod Bentley Text
    youtube.com/watch?v=pRDIOLdQJv

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  27. Colin the Mathmo @[email protected] ·

    Next video from #G4G15 :

    Bill Cheswick:
    Paul Erdos' Brain was in Town
    youtube.com/watch?v=XvzAQdjQ4d

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  28. Colin the Mathmo @[email protected] ·

    Next video from #G4G15 :

    Eleftherios Pavlides:
    Polymorphic Elastegrity (PE): From Recreational Paper Folding to the Tree of Polymorphisms
    youtube.com/watch?v=qnP6jRtGLy

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  29. Colin the Mathmo @[email protected] ·

    Video from #G4G15 :

    Robert Pope Vermillion: The Impossible 3000.1
    youtube.com/watch?v=Dds2gFpWv8

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths
  30. Colin the Mathmo @[email protected] ·

    Inna Zakharevich:
    Computing with Paper

    youtube.com/watch?v=G3XU1PSwVR

    A video from #G4G15

    From the playlist:
    youtube.com/playlist?list=PL5_

    All part of the #G4G series of videos:
    youtube.com/@G4GCelebration/pl

    Boosts welcome (if content to do so)

    #RecreationalMaths #RecMaths
    #RecreationalMath #RecMath
    #MTBoS #MathEd #MathEdChat

    #mathedchat #mathed #mtbos #recmath #recreationalmath #recmaths