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Complex Numbers
Complex Numbers

A complex number is expressed in the standard form a + bi, where a and b are real numbers and i is defined by i^2 = -1 (that is, i is the square root of -1). For example, 3 + 2i is a complex number.

The bi term is often referred to as an imaginary number (though this may be misleading, as it is no more "imaginary" than the symbolic abstractions we know as the "real" numbers). Thus, every complex number has a real part, a, and an imaginary part, bi.

Complex numbers are often represented on a graph known as the "complex plane," where the horizontal axis represents the infinity of real numbers, and the vertical axis represents the infinity of imaginary numbers. Thus, each complex number has a unique representation on the complex plane: some closer to real; others, more imaginary. If a = b, the number is equal parts real and imaginary.

Very simple transformations applied to numbers in the complex plane can lead to fractal structures of enormous intricacy and astonishing beauty.




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November 20, 2024 at 9:56am
November 20, 2024 at 9:56am
#1080216
From Quanta, and as usual for that source, may not be suitable for numerophobes:

    How Base 3 Computing Beats Binary  Open in new Window.
Long explored but infrequently embraced, base 3 computing may yet find a home in cybersecurity.


There's been talk of quantum computers being used for that, as well. Difference is, from what I understand, quantum computing is still very much in its infancy.

Three, as Schoolhouse Rock! told children of the 1970s, is a magic number.

Thanks. Now I have an earworm.  Open in new Window.

The number 3 also suggests a different way of counting. Our familiar base 10 decimal system uses the 10 digits from zero to 9. Binary, our digital lingua franca, represents numbers using only the two digits zero and 1.

One of my favorite nerdy jokes: "There are 10 kinds of people in this world: Those who understand binary, and those who don't."

The hallmark feature of ternary notation is that it’s ruthlessly efficient. With two binary bits, you can represent four numbers. Two “trits” — each with three different states — allow you to represent nine different numbers.

"Trits?" No. "Bits" is short for binary digits. If you have trinary digits, using the same convention would yield something way funnier.

It turns out that ternary is the most economical of all possible integer bases for representing big numbers.

The article explains why, or we can just take their word for it. But:

For large numbers, base 3 has a lower radix economy than any other integer base. (Surprisingly, if you allow a base to be any real number, and not just an integer, then the most efficient computational base is the irrational number e.)

That doesn't surprise me at all, except the surprise of being allowed to have a non-integer base number. The irrational number e is 2.71828..., which is closer to 3 than to any other integer.

Despite its natural advantages, base 3 computing never took off, even though many mathematicians marveled at its efficiency. In 1840, an English printer, inventor, banker and self-taught mathematician named Thomas Fowler invented a ternary computing machine to calculate weighted values of taxes and interest.

What pleases mathematicians doesn't usually please the rest of us.

Why didn’t ternary computing catch on? ... Binary was easier to implement.

Thus showing once again that "easier to implement" doesn't always translate to "most efficient to run."

How does this affect us? Well, it doesn't, much. Numbers have to be shifted to decimal notation either way, so we can do things like taxes and budgets. Mostly, I'm just disappointed with "trits."


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