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interlink with convolution with approximate delta
add wikipedia link for Littlewood's principles
Removed words "(a fact I will prove later in this course)"
Added a first paragraph on General Discussion with a simpler use of the trick (specialization to sequences) for the newbie; also elaborating the trick on a more abstract setting at the same time (limits of nets). Check it, plz!
Typo
Added "A non-trivial circular argument can often be usefully perturbed to a non-circular one" as a parent
Added "exercise 1" to the maximum principle for harmonic functions (use another epsilon of room to improve the previous result) and renamed the existent exercise to "exercise 2"
Clean up.
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Tricki