| This image is reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby |
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| 6864 | Volume 24 | 15-Jun-68 | Westons | 6865 | Volume 24 | 1968 |
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Summary: Set theory's way of saying "∂Φ/∂x = 0". |
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| This page is referenced from page 6873 |
| This image is reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby |
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