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1bnielsen
I decided that the group could do with a group picture. Feel free to replace it if you don't like it.
2guido47
Well I recently got Gauss
I was always taught Gauss was one of the greatest Mathematicians, so I will add his portrait to the member gallery when I find a suitable
image :-)
As to what should be a groups "primary" picture is always worth a good bun fight.
Guido.
PS. I am also a member of a LT CAT group with 123 or so pictures. I once had to bribe the group administrator
with a picture of a cake, to get one of my favourites be made primary picture :-)
Group administrators are so fickle...
I was always taught Gauss was one of the greatest Mathematicians, so I will add his portrait to the member gallery when I find a suitable
image :-)
As to what should be a groups "primary" picture is always worth a good bun fight.
Guido.
PS. I am also a member of a LT CAT group with 123 or so pictures. I once had to bribe the group administrator
with a picture of a cake, to get one of my favourites be made primary picture :-)
Group administrators are so fickle...
3bnielsen
Feel free to add pictures. I'm fresh out of buns :-)
The current picture is a Osgood curve and you can find a similar hand-drawn! curve in the Transactions of the American Mathematical Society, 1903:
A Jordan curve of positive Area, by William Fogg Osgood (1864-1943), Trans. Amer. Math. Soc., 4 (1903), pp. 107-112.
And of course a correction (also hand-drawn) in the next issue!
The curve can be constructed by a Lindenmayer system.
Start "-FX+YF"
Rules: 'X' -> "X+YFFFX+YF-F-FX+YF-F-FX+YF-F-FX+YFFFX+YFFFX", 'Y' -> "YFFFX+YF-F-FX+Y".
You start with the startsequence and apply the rules to get the next iteration. Then you apply the rules again to get next iteration and so on. When you decide to stop, you delete all X and Y's from the sequence and interpret the string as Turtle graphics. i.e. + = turn 90 degrees, - = turn -90 degrees, F = forward one unit.
I think it would be fun if any of you have similar (short) stories and pictures to add to the group gallery.
The current picture is a Osgood curve and you can find a similar hand-drawn! curve in the Transactions of the American Mathematical Society, 1903:
A Jordan curve of positive Area, by William Fogg Osgood (1864-1943), Trans. Amer. Math. Soc., 4 (1903), pp. 107-112.
And of course a correction (also hand-drawn) in the next issue!
The curve can be constructed by a Lindenmayer system.
Start "-FX+YF"
Rules: 'X' -> "X+YFFFX+YF-F-FX+YF-F-FX+YF-F-FX+YFFFX+YFFFX", 'Y' -> "YFFFX+YF-F-FX+Y".
You start with the startsequence and apply the rules to get the next iteration. Then you apply the rules again to get next iteration and so on. When you decide to stop, you delete all X and Y's from the sequence and interpret the string as Turtle graphics. i.e. + = turn 90 degrees, - = turn -90 degrees, F = forward one unit.
I think it would be fun if any of you have similar (short) stories and pictures to add to the group gallery.
