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Příklad - paprsek, kulová kapka a duha
Author:
Martin Vinkler
http://ww2.odu.edu/~jadam/docs/rainbow_glory_review.pdf
https://skullsinthestars.com/2013/05/13/all-about-rainbows-double-rainbows-circular-rainbows/
http://iopscience.iop.org/article/10.1088/0143-0807/37/6/063001/meta
http://www.rebeccapaton.net/rainbows/index.htm
http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/rainbowcon.html#c1
http://mathdemos.org/mathdemos/MCRain/MCRain.html
https://plus.maths.org/content/rainbows
http://www.ams.org/samplings/feature-column/fcarc-rainbows
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קביעת נקודות ותחומים מיוחדים על סמך הנגזרת
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matthew nicholson translation
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