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6826 Volume 24 27-Dec-67 6827 Volume 24 1967
Summary: [formula]
 Summary: Closures of projections and vice versa. Example: 6830
This page references page 6521
This page is referenced from page 6523		 This page references page 6830
This page is referenced from page 6829
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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