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I am reading the book, Basic Abstract Algebra by P.B. Bhattacharya, S.K. Jain, and S.R. Nagpaul ... ... and am currently focused on Chapter 2: Integers, Real Numbers and Complex Numbers ...
I need help with an aspect of the proof of the Fundamental Theorem of Arithmetic in Section 1.3 ... ... The Fundamental Theorem of Arithmetic and its proof as presented by Bhattacharya et al reads as follows:View attachment 5948
View attachment 5949In the above text we read the following:" ... ... So let \(\displaystyle p_1 \neq q_1\). For definiteness, let \(\displaystyle p_1 \gt q_1\). Then\(\displaystyle n \gt (p_1 - q_1) p_2 \ ... \ p_s = p_1p_2 \ ... \ p_s - q_1p_2 \ ... \ p_s \)\(\displaystyle = q_1q_2 \ ... \ q_t - q_1p_2 \ ... \ p_s = q_1 (q_2 \ ... \ q_t - p_2 \ ... \ p_s)\)By the induction hypothesis either \(\displaystyle q_1 = p_i\) for some \(\displaystyle i = 2, \ ... \ , s\) or
\(\displaystyle q_1 | (p_1 - q_1)\). ... ... "I do not follow how \(\displaystyle n \gt (p_1 - q_1) p_2 \ ... \ p_s = p_1p_2 \ ... \ p_s - q_1p_2 \ ... \ p_s
\)\(\displaystyle = q_1q_2 \ ... \ q_t - q_1p_2 \ ... \ p_s = q_1 (q_2 \ ... \ q_t - p_2 \ ... \ p_s)\)leads to either \(\displaystyle q_1 = p_i\) for some \(\displaystyle i = 2, \ ... \ , s\) or \(\displaystyle q_1 | (p_1 - q_1)\). ... ...
Can someone slowly and clearly explain exactly how the above follows ...Hope someone can help ... ...
Peter
======================================================The above refers to what Bhattacharya et al call the Second Principle of Induction ... this principle reads as follows in their text ... ... :
View attachment 5950
I need help with an aspect of the proof of the Fundamental Theorem of Arithmetic in Section 1.3 ... ... The Fundamental Theorem of Arithmetic and its proof as presented by Bhattacharya et al reads as follows:View attachment 5948
View attachment 5949In the above text we read the following:" ... ... So let \(\displaystyle p_1 \neq q_1\). For definiteness, let \(\displaystyle p_1 \gt q_1\). Then\(\displaystyle n \gt (p_1 - q_1) p_2 \ ... \ p_s = p_1p_2 \ ... \ p_s - q_1p_2 \ ... \ p_s \)\(\displaystyle = q_1q_2 \ ... \ q_t - q_1p_2 \ ... \ p_s = q_1 (q_2 \ ... \ q_t - p_2 \ ... \ p_s)\)By the induction hypothesis either \(\displaystyle q_1 = p_i\) for some \(\displaystyle i = 2, \ ... \ , s\) or
\(\displaystyle q_1 | (p_1 - q_1)\). ... ... "I do not follow how \(\displaystyle n \gt (p_1 - q_1) p_2 \ ... \ p_s = p_1p_2 \ ... \ p_s - q_1p_2 \ ... \ p_s
\)\(\displaystyle = q_1q_2 \ ... \ q_t - q_1p_2 \ ... \ p_s = q_1 (q_2 \ ... \ q_t - p_2 \ ... \ p_s)\)leads to either \(\displaystyle q_1 = p_i\) for some \(\displaystyle i = 2, \ ... \ , s\) or \(\displaystyle q_1 | (p_1 - q_1)\). ... ...
Can someone slowly and clearly explain exactly how the above follows ...Hope someone can help ... ...
Peter
======================================================The above refers to what Bhattacharya et al call the Second Principle of Induction ... this principle reads as follows in their text ... ... :
View attachment 5950