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    Cover of Turtle geometry

    Turtle geometry

    Harold Abelson, Andrea diSessa · 1980

    Turtle Geometry presents an innovative program of mathematical discovery that demonstrates how the effective use of personal computers can profoundly change the nature of a student's contact with mathematics. Using this book and a few simple computer programs, students can explore the properties of space by following an imaginary turtle across the screen. The concept of turtle geometry grew out of the Logo Group at MIT. Directed by Seymour Papert, author of Mindstorms, this group has done extensive work with preschool children, high school students and university undergraduates.

    ProgrammingMathematics
    Open LibraryAmazon
    Stats for nerds
    15recommend
    50mentions
    27people
    2007–2026years
    62% recommend38% neutral

    Mentions per year

    20072009201120132015201720192021202320252026

    What Hacker News says

    1. turtlegeometrySep 2026
      This is on top of HN right now, and there is still nobody who has mentioned the fact that the tier-1 book Turtle Geometry <https://direct.mit.edu/books/oa-monograph/4663/Turtle-Geomet...> , is in open access.

      Do yourself a favor, and read it today : it is that good. Even though it is quite depressing to see that the revolution in education that the book was predicting in its preface, simply never happened.

      thread
    2. taericJul 2024
      This is a hill I will die on. Probably literally. If you are writing in a metaphor of equations, than yes, mutation is almost certainly going to bite you. If you are writing in a metaphor of process, you almost certainly want to manage, as you say.

      I feel that early texts were good at this. Turtle Geometry is my personal favorite book in this vein. I seem to recall we spent a long time going over how to double buffer graphics so that you could be working on one buffer while letting the system draw the other. Not sure what texts we used for that, back in the day.

      Later texts, though, go through a lot of hurdles to hide the fact that things are actively changing. The entire point is to change things.

      thread
    3. pleasejustdontJun 2024
      I know this is not what you are looking for, but I just wanted to take advantage of your post to remind the HN crowd of the fact that the magnificent book Turtle Geometry: The Computer as a Medium for Exploring Mathematics is available in Open Access at : https://direct.mit.edu/books/oa-monograph/4663/Turtle-Geomet... . One of the co-author is no less than Harold Abelson, who is also a co-author of the (in)famous SICP.

      If you are looking for a book a little less hardcore than the previous recommendation, check out Visual Modeling With Logo: A Structured Approach to Seeing by James Clayson.

      thread
    4. taericAug 2023
      You might like the book Turtle Geometry. Has fun exploring a similar direction, some.
      thread
    5. bmitcDec 2022
      I do agree that programming is very useful as a medium of exploration, a la what you said. I really like how the book Turtle Geometry approaches this. But that is really something different than what the quoted text is attempting to get at.

      > I would not sell yourself short on being able to understand.

      I have a master's in mathematics and have continued to take courses while working full-time. It's just that I'm more than aware of the amount of mathematics I do not know compared to an active graduate student in mathematics and above. Or maybe you meant the royal you.

      thread
    6. ZeroGravitasNov 2022
      Turtle Geometry: The Computer as a medium for exploring Mathematics

      By Harold Abelson

      https://direct.mit.edu/books/book/4663/Turtle-GeometryThe-Co...

      Gets to Curved Space-Time by chapter 9.

      thread

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