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When I come across a notion from algebra or number theory which I don't know I usually check Keith Conrad's page to see if he has written something about it. Key features of his articles are a very clear exposition and carefully worked-out, well-chosen examples. Furthermore, he explains why the definitions are the way the are (why do we require a subring of a unital ring to have the same multiplicative identy as the original ring?).

I am now looking for articles of similar style and quality explaining the basic notions of analysis (both real and complex analysis) and probability theory (so they should be aimed at undergraduate students). More specifically, I mean the notions (and central theorems) you would expect to learn in any undergraduate course on the subject at a German university. The content descriptions of the courses in the following document might give you an idea of what that means: mathematics.uni-bonn.de/study/master/files/MA_QualTest.pdf The courses are: Analysis I & II (page 2), Analysis III (page 3), Introduction to complex analysis (p. 4), Introduction to Probability & Stochastik Processes (both p. 6).

I tried to find something using google and the only thing I found is http://www.mtts.org.in/expository-articles. There are articles on theorems from analysis on that site, but they focus on proofs and do not contain enough motivation for definitions or interesting examples (as far as I checked, I did not read them all). The articles should not be too dense (to give you an idea of what that means: They should not be as dense and short as the articles in the Princeton Companion).

Note that I am looking for articles which are available freely online.

I am aware of the related question Elementary Papers at ArXiv, however, I ask for articles explaining ideas and notions from analysis and probability theory only and do not require the articles to be posted on the arxiv.

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    I like this question for two reasons: 1) I find such articles a great bedtime or airplane/train/bus reading, and 2) because I like to share them with interested undergraduates, and I think they really appreciate such articles. Unfortunately I don't have an answer for you, but I am hoping someone will. I'm interested also.2012-01-13
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    Should this be CW?2012-01-13
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    I hope this is \*not\* made CW. This is a nicely phrased question, and making it CW will rob the OP [and the answerers] of some well-deserved points.2012-01-16
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    Do you only want online resources? The _Princeton Companion_ is actually pretty decent for this, in my opinion.2012-01-16
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    Also, what do you consider to be "basic notions" in analysis/probability theory?2012-01-16
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    @Willie Wong: As for your second comment: By basic notions I mean the notions (and central theorems) you would expect to learn in any undergraduate course on the subject at a German university. The content descriptions of the courses I will point you to in the linked document might help to make this precise: http://www.mathematics.uni-bonn.de/study/master/files/MA_QualTest.pdf The courses are: Analysis I & II (page 2), Analysis III (page 3), Introduction to complex analysis (p. 4), Introduction to Probability & Stochastik Processes (both p. 6).2012-01-20
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    As for your first suggestion: Yes, I only want online resources. I also had a look at the Princeton Companion and found it was not exactly what I am looking for for the following reasons: It does not treat enough of the basic notions I'd like to read about. The articles are quite short and dense (in contrast to the ones by Keith Conrad linked to above). Finally, there are a lot of cross references which makes it harder to read the articles if there are several notions new to you in the article. Note that I'm not saying I did not like reading it, it is just not what I'm looking for.2012-01-20
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    @Lennart: may I suggest that you edit your question statement with the two clarifications you just gave?2012-01-20

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