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This file is a draft of the new changes for http://www.jirka.org/ra/changes.html | ||
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<li>When stating that well ordering of $\mathbb{N}$ and induction are | ||
equivalent, hedge our bets with "in a sense" and add a footnote mentioning | ||
that we are really assuming $n-1$ exists (which is obvious from the proof). | ||
In a related change, make exercise 0.3.18 just straight to the point and | ||
don't mention the equivalence. | ||
<li>Reword the beginning of the proof of Example 1.2.3. | ||
<li>Make Proposition 1.4.1 more readable. | ||
<li>In the proofs of Propositions 2.3.2, 2.3.6, Example 3.1.8, when referring to a sequence, always | ||
use braces. | ||
<li>Add explicit link/reference to chapter 7 to remark 2.4.6. | ||
<li>Add another example restriction on which $g$ is continuous to Example 3.2.13. | ||
<li>Reword Lemma 3.3.1 and Theorem 3.3.2 (min-max) as a simpler single sentence. | ||
<li>Make the Min-max theorem alternatively titled "Extreme value theorem" which | ||
is more common. Emphasize the "closed and bounded" in the theorem | ||
statement. | ||
<li>Reword the proof of Proposition 4.1.10 a little bit to make it clearer. | ||
Also include a tiny bit more motivation. | ||
<li>Add some intuition (being in a fog analogy) to the intro for critical points. | ||
<li>Add Remark 5.1.15 to say something about integral being a sum and being | ||
global as opposed to derivatives being local. | ||
<li>In 5.2 add a few more motivating sentences. And merge the paragraph from | ||
below Proposition 5.2.5 to the one above it to make things flow a little better. | ||
<li>Mark 5.5.13 as "Integral test," and add that to the index. | ||
<li>In 6.3, define "initial condition" as a term. | ||
<li>At the end of 6.3, reword the quip about continuity being necessary and add a | ||
very short remark about Peano existence if $F$ is only | ||
continuous, to justify Example 6.3.6 being discontinuous. | ||
<li>Name the identity bit of Definition 7.1.1 the "identity of | ||
indiscernibles." It is a bit wordy, but it feels like the property ought to | ||
have a name if the others do. | ||
<li>Reword proof of Proposition 7.2.14 to do the forward direction first. | ||
<li>Add $A \subset \overline{A}$ to Proposition 7.2.19 rather than just in text. | ||
The proof flows much nicer then. | ||
<li>Several small clarifications. | ||
<li>A few more explicit references/links. | ||
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This file is a draft of the new changes for http://www.jirka.org/ra/changes2.html | ||
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<li>On page 11, add a short note about the $d+1$ linearly independent | ||
vectors from the definition of dimension. | ||
<li>In Exercise 8.4.7, assume $q$ is not identically zero. The result is | ||
vacuously true even if $q$ is identically zero, but there is no reason to | ||
make students think about this rather stupid technicality. | ||
<li>The proof in Example 8.1.25 is hopefully clearer. | ||
<li>In definition 8.3.8, remove the definition of the notation $D_j f$. We | ||
never used it later. | ||
<li>In Definition 9.2.1, change the definition of "simple" for non-closed | ||
paths. Typically a path that bites itself back in the middle is not called | ||
simple, so rule out that case. | ||
<li>Rename subsection 10.3.3 to "Images of null sets under differentiable | ||
functions". | ||
<li>In proof of Lemma 10.3.9, say how to prove it for open balls. | ||
<li>Improve definition 10.6.1 to be (much) simpler (though equivalent): Only | ||
take a finite disjoint union of simple closed sets as we are assuming $U$ | ||
is bounded anyway. | ||
<li>Reorder the proof of Theorem 10.7.2 a little bit to make it more logical. | ||
<li>On page 148, add a short note that the $e^{z+w}=e^ze^w$ leads to a quick | ||
computation of the power series at any point. | ||
<li>In Corollary 11.3.7, emphasize that that $a$ is any complex number, | ||
since just above it was a real number. | ||
<li>In definition of the exponential on page 147 (the definition of | ||
$E(z)$) explicitly say that this means that it is analytic. | ||
<li>Be more precise in Exercise 11.4.9 to say to derive the power series at the | ||
origin. | ||
<li>In Example 11.6.3, emphasize that $f_n$ are continuous. | ||
<li>In 11.8.2, when saying we could develop everything with sines and | ||
cosines, give the actual form of the series and refer to Euler's formula, | ||
so that when we later call such series also Fourier series, the reader is | ||
not confused. |