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Article #1438

how do you do the one about an infinite mesh of 1ohm resistors ...

#1438
From: O.MostynOwen
Date: Fri, 24 Jul 1992 15:03
38 lines
1937 bytes
There's a problem I was told about years ago which I never managed to solve:

You've got an infinite 2D grid if 1 ohm resistors. What's the resistance
across 1 of them (no it's not 1ohm, 0 or infinity).

                              .
                              .
                              .
                              .

              |                  |                   |
              |                  |                   |
         ------------1ohm-----------------1ohm------------
              |                  |                   |
              |                  |                   |
 .....      1ohm               1ohm                1ohm     .....
              |                  |                   |
              |                  |                   |
         ------------1ohm-----------------1ohm------------
              |                  |                   |
              |                  |                   |

                              .
                              .
                              .
                              .

The only clue I got was that you could solve it using Fourier Transforms.
Anyone remember seeing a solution?  

I'd be grateful if someone laid this one to rest since it keeps on coming
back to haunt me.

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Owen Mostyn-Owen                                     +44 71 387 7050 ext 3687
Internet: omostyno@cs.ucl.ac.uk   UUCP: ...!{uunet,uknet}!ucl-cs!O.MostynOwen
Computer Science, University College London, Gower Street, LONDON WC1E 6BT
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From: O.MostynOwen@cs.ucl.ac.uk
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Subject: how do you do the one about an infinite mesh of 1ohm resistors ...
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Date: 24 Jul 92 15:03:14 GMT
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