Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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**b)** Use the idea in part (a) to determine an explicit one-to-one correspondence between ℤ⁺ and the set of all ordered pairs of positive integers.

**c)** Use part (a) to give a different proof of Theorem 1.26.

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Transcribed Image Text:Sure, here's the transcription: --- **b)** Use the idea in part (a) to determine an explicit one-to-one correspondence between ℤ⁺ and the set of all ordered pairs of positive integers. **c)** Use part (a) to give a different proof of Theorem 1.26. --- There are no graphs or diagrams in the image.
**Educational Text Transcription:**

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14. Interpret the set of all ordered pairs of positive integers as a grid of dots in the first quadrant of the xy-plane. Consider the "path" that traverses these dots in the following order:

(1, 1), (2, 1), (1, 2), (3, 1), (2, 2), (1, 3), (4, 1), (3, 2), (2, 3), (1, 4), (5, 1), …

a) Show that this constitutes a proof that the set of all ordered pairs of positive integers is countably infinite.

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**Explanation:**

The list of ordered pairs (x, y) begins at (1, 1) and moves along diagonals in the grid. This sequence demonstrates how every possible pair of positive integers can be systematically listed, showing that they correspond to the natural numbers through this process. This is a classic method for proving the countability of the set of all ordered pairs of positive integers.
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Transcribed Image Text:**Educational Text Transcription:** --- 14. Interpret the set of all ordered pairs of positive integers as a grid of dots in the first quadrant of the xy-plane. Consider the "path" that traverses these dots in the following order: (1, 1), (2, 1), (1, 2), (3, 1), (2, 2), (1, 3), (4, 1), (3, 2), (2, 3), (1, 4), (5, 1), … a) Show that this constitutes a proof that the set of all ordered pairs of positive integers is countably infinite. --- **Explanation:** The list of ordered pairs (x, y) begins at (1, 1) and moves along diagonals in the grid. This sequence demonstrates how every possible pair of positive integers can be systematically listed, showing that they correspond to the natural numbers through this process. This is a classic method for proving the countability of the set of all ordered pairs of positive integers.
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