# Thread: Does the premise, "Its turtles all the way down," have a leg to stand on?

1. First, assume a spherical turtle....

2. Originally Posted by Tobin Dax
You might have just turned cosmology on it's head. Obviously, from that picture, it's turtles all the way up!
No; the picture is just upside down. They are bench pressing the earth.

3. Originally Posted by Nicolas
Finally someone agrees with me that 1.999...(infinite nines) equals 2.
Except it doesn't...this is math we're talking about. Not some sloppy best guess and feelings will do discipline, like medicine or engineering...

4. Originally Posted by BigDon
Except it doesn't...this is math we're talking about. Not some sloppy best guess and feelings will do discipline, like medicine or engineering...
The word "infinite" is the key, Don. They are equal. There are a few older threads around on the topic (of 0.999... equaling 1), but I can't find them at the moment.

5. Originally Posted by BigDon
Except it doesn't...this is math we're talking about. Not some sloppy best guess and feelings will do discipline, like medicine or engineering...
Somehow I want to expand on what Tobin Dax said in an attempt to keep this sidetrack short.

In sloppy disciplines such as rocket engineering or brain surgery, we could agree that 1.9999 equals 2.
In an exact discipline like math, we can never say that 1.9999 equals 2.
However, in the exact discipline math, there is a definition of infinity that states that 1.999... (mathematically infinite nines) equals 2 by definition of infinity.

Now there is a beatiful old thread to argue this point further (please don't ); the above is just the definitions as they are.

6. Since the Flat Earth hypothesis is largely disproven, it would have to be turtles all the way in, with the turtles at the Earth's core shrinking to infinitesimal size.

7. Anyone here read Yertle the Turtle? The turtles get upset if you stack them too high.

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Originally Posted by Nicolas
Finally someone agrees with me that 1.999...(infinite nines) equals 2.
I agree with you, even if I think the example seems more relevant to the equality of of 1.111...(base two) and 10 (base two).

9. Given that it are 4 elephants on the back of a turtle supporting the earth, I'd suggest we use base 4 in this case.

10. Maybe it's one turtle with infinitely long legs.

11. Maybe dark matter is made of turtles?

12. Originally Posted by Swift
Maybe dark matter is made of turtles?
So A'Tuin is swimming in an aether of quantum pico-turtle foam?

13. We had some quantum pico-turtle foam in the terrarium before I cleaned it out.

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