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The very first mention of people trying to use imaginary numbers dates all the way back to the 1st century. In 50 A.D., Heron of Alexandria studied the volume of an impossible section of a pyramid.
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What is an imaginary number? What is i?; Contrary to what some people might tell you, imaginary numbers are not numbers that only exist in the brains of weird people. Or maybe they are; all numbers in math are "imaginary" in the sense that you can't touch them or experience them directly.
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mathforum.org/dr.math/faq/faq.imag.num.html
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Imaginary Numbers - Math Forum, Ask Dr. Math FAQ; What is an imaginary number? What is i? more>> ... Proving an arrow can never move - analyzing motion, the beginning of calculus. How Archimedes calculated Pi to ...more>>
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mathforum.org/library/topics/complex_numbers/
mathforum.org/library/topics/complex_numbers/
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Beginning algebra students are naturally confused, and so were centuries of mathematicians. Imaginary numbers almost appeared in the geometry of Heron of Alexandria in the first century...
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www.firstthings.com/processors/proc.old_onthesquare_art...
www.firstthings.com/processors/proc.old_onthesquare_article_redirect.php?id=839
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You do a bunch of math, which includes imaginary numbers. In the end, you wind up with the answer, which (of course) involves all real numbers again. But it would have been difficult or impossible to ... This lecture, by the way, usually comes toward the end of day 1, or during day 2—not at the very beginning of day 1.
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cnx.org/content/m19424/latest/
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The first imaginary number is called "i." All other imaginary numbers are multiples of it. "The numbers whose square is negative one" is one way of expressing "i." It makes sense then that should also involve i. The square root of is 2i -- the square root of -1 is i, the square root of 4 is 2.
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www.mathnstuff.com/math/spoken/here/3essay/eimage.htm
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Imaginary numbers are real numbers multiplied by i. If, like many, you find yourself saying "but what's the point?" then think on this. Imagine a world without electric circuits. No circuits, so no computers. No computers, so you wouldn't ... But if the Big Bang marks the beginning of time and the beginning of matter,
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www.bbc.co.uk/radio4/science/5numbers4.shtml
www.bbc.co.uk/radio4/science/5numbers4.shtml
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A quirky look at five of the most important numbers in mathematics. Hear about the stark reality behind the imaginary number, try a slice of pi, find out about the natural beauty of the golden ratio, discover why some infinities are bigger than others, and see why nothing really matters.
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www.bbc.co.uk/radio4/science/5numbers.shtml
www.bbc.co.uk/radio4/science/5numbers.shtml
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Introduces the imaginary number 'i', and demonstrates how to simplify expressions involving the square roots of negative numbers. Warns about a common trick question. ... that is, numbers without the "i" in them.) The imaginary is defined to be:
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www.purplemath.com/modules/complex.htm
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