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I am reading Ethan D. Bloch's book: The Real Numbers and Real Analysis ...
I am currently focused on Chapter 1: Construction of the Real Numbers ...
I need help/clarification with an aspect of Theorem 1.2.7 (1) ...
Theorem 1.2.7 reads as follows:
In the above proof of (1) we read the following:" We will show that ##G = \mathbb{N}##, which will imply the desired result. Clearly ##G \subseteq \mathbb{N}##. ... ... ... "Before he proves that ##1 \in G##, Bloch asserts that ##G \subseteq \mathbb{N}## ... what is his reasoning ...?
It does not appear to me ... from the order in which he says things that he is saying
##1 \in G## ... therefore ##G \subseteq \mathbb{N}## ...
Can we immediately conclude that ##G \subseteq \mathbb{N}## without relying on ##1 \in G## ... ... ?
(Bloch does the same in a number of places in this chapter ... )Hope someone can help ... ...
Peter
I am currently focused on Chapter 1: Construction of the Real Numbers ...
I need help/clarification with an aspect of Theorem 1.2.7 (1) ...
Theorem 1.2.7 reads as follows:
In the above proof of (1) we read the following:" We will show that ##G = \mathbb{N}##, which will imply the desired result. Clearly ##G \subseteq \mathbb{N}##. ... ... ... "Before he proves that ##1 \in G##, Bloch asserts that ##G \subseteq \mathbb{N}## ... what is his reasoning ...?
It does not appear to me ... from the order in which he says things that he is saying
##1 \in G## ... therefore ##G \subseteq \mathbb{N}## ...
Can we immediately conclude that ##G \subseteq \mathbb{N}## without relying on ##1 \in G## ... ... ?
(Bloch does the same in a number of places in this chapter ... )Hope someone can help ... ...
Peter