Assume a, b, c, d ∈ Z. Prove each of the following. (a) If a|(15b−c) and 7c∼=5b (mod2a), then a|20c. (b) If a|b and b|c then a|c. (c) Prove the following deduction ∴ a|0 and if 0|a then a = 0. (d) Prove the deduction ∴(d|(ab+c)&d|b) ⇐⇒ (d|b&d|c)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Assume a, b, c, d ∈ Z. Prove each of the following. (a) If a|(15b−c) and 7c∼=5b (mod2a), then a|20c. (b) If a|b and b|c then a|c. (c) Prove the following deduction ∴ a|0 and if 0|a then a = 0. (d) Prove the deduction ∴(d|(ab+c)&d|b) ⇐⇒ (d|b&d|c)
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