Charts Definition and 54 Threads

  1. P

    Coordinate charts to cover a circle?

    4 charts seem to cover it. BUt only 2 will do for a minimal number? Just like 2 charts will do to cover a sphere? Even though there are 6 all together.
  2. Pyrrhus

    Creating Gradation Charts with Software

    Hey guys, does anyone uses or knows about a software package that allows me to do gradation charts? (a gradation chart is a simple graphic where the x-axis is in logarithmic scale and the y-axis is in natural scale)
  3. D

    How many coordinate charts does it take to cover a surface?

    I was wondering about this, I've never seen any general theorem. Obviously it takes more than one, but I would think that in general it can take quite a few, for I can't see how to cover a torus with only 2. Is there any sort of general result on this?
  4. I

    Max amps in a wire? Any charts or

    anything out there that could help me with this? or is there no limit? or does it depend on gauge?
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