Show that by example the convergence by rows of a double series does not imply convergence by columns, but if the sum by rows, columns and rectangles all exist, then all three must be equal.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Need clear handwriting , free Plagiarism Show that by example the convergence by rows of a double series does not imply convergence by columns, but if the sum by rows, columns and rectangles all exist, then all three must be equal.

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