# Complex #atozchallenge

Remember when you were in grammar school, and you were first learning about the square root, and how they told you that you couldn’t take the square root of a negative number? They lied.

OK, they didn’t exactly lie to you, though what they should have told you was “for now, you can’t take the square root of a negative number.” Eventually, though, you would have to come to grips with the fact that, sometimes, it was necessary to pretend that you could, like when you were faced with the equation

a2 + 4 = 0

In this case, you know that a2 = -4, so a = √-4. Now, understand, you still can’t take the square root of a negative number, but we can always imagine that we can. Now, √-4 = √-1 · √4. The square root of 4 is 2, and let’s call the square root of -1 i, the i standing for “imaginary.” (Saying that the i stands for “imaginary” might make a few mathematicians scowl, but screw ’em if they can’t take a joke.)

Numbers of the form a + bi, where a and b are real numbers, are called complex numbers, because they’re made up of a real part and an imaginary part. You can even plot them on graph paper, with the real part on the x axis and the imaginary part on the y axis. That makes your graph an Argand diagram.

That’s all I want to say about complex numbers, other than to say that they make it possible to solve some equations in science and engineering. Just take my word for it…

## 43 thoughts on “Complex #atozchallenge”

1. Gross. I couldn’t read this. It was worse than baseball!
You really do write well, I tried, lol! Math and I just don’t meet beyond basic computation!

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2. OMG Mr. John, you’re a genius!! You and my husband and oldest son are totally on the same page when it comes to the mathematical stuff. My son when he was in 3rd grade, yes 3rd grade was trying to explain the Pythagorean theory to me. Still don’t get it and don’t even try. He got a perfect score on the math ACT’’s and SAT’s.. I’m hoping I just explained it right. How cool 😎 aye you a writer and a genius mathematician. W O W

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1. I’m not so much a genius in math as a collector of ephemera, I think. When I hit real analysis and abstract algebra, my mind shut down…

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1. Well I may have you beat on the ephemera 😉 now if I could just pronounce it grammatically. It’s just one of those words I have to think about before I say it!! Happy Thursday, Mr. John. Love your blog, I always learn something new when I read it !!!

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3. AJ Blythe says:

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1. Mine was hurting when I got to the last paragraph and I decided that I’d have too much to re-learn to continue.

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4. Yipes, I left all that mess back in college. I really liked math, but nobody ever showed me any practical application for it, so it held no meaning to me… I did ace statistics at the university which astounds me to this day!

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5. Oh my! Where have you been when I was in high school? Thanks for the school memories, I can’t believe I was actually good at algebra. Now as I see my kids talking about math problems I hide under the dining table.

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6. I’ll take your word for it. Imaginary numbers … who knew? Guess I blocked that from my memory banks.

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7. Sitting in my apartment complex thinking about how complex this math situation is. Perplexed (you can use that one for P if you haven’t already assigned it!)

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8. You can’t but you can. It is but it isn’t. Poetry works that way, too.

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9. I’ll take your word for it! I wish I could understand complex mathematics, since people who have a calling for it say there’s great beauty and art in those equations and numbers.

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10. I’m math challenged so I’m out of my depth here. But I have to say I delight in a world where there are both complex numbers and imaginary ones.

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11. I’ll take your word for it – because now I’m utterly confused. I think I’ll stick to playing with words LOL

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12. Definitely will take your word for it, John. I got a headache looking at those equations. More power to the people who actually know what they mean.

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13. Ed Thierbach says:

In the play “Love and Information”, there’s a scene entitled “Imaginary Numbers”. It contained one of my favorite lines: “Can you have an imaginary number of oranges?” That pretty much sums up my view of complex math. 🙂

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14. Funny! My daughter just finished a course that included imaginary numbers! And the square root of negatives too. I will be sending her the link for this post.

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15. It’s comforting to see someone else venture into math in a blog post, John. May you have better luck than I have had.

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1. I take the occasional sortie into math here once in a while, though I tend to keep it to things that I actually understand…

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16. Jack Connelly says:

I thought I was listening to my father. As Beth said (above), I’ll take your word for it.

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1. I ended where I did because I was getting into areas where the discussion could become a little too complex…

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17. Math lesson for the day! Thanks! 🙂

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18. Yikes John, but thank you. I like numbers muchly but this is seriously complex ..

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19. Imaginary numbers are not useful to most people, but once electricity changed from DC to AC, they are valuable for every electrical engineer in order to calculate AC current and voltage.

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1. Exactly. They’re useful if you’re an engineer, which I wasn’t…

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20. Ouch, math… I have somewhat of a difficult relationship with it. I love it, but my brain isn’t so enamored with it to study it deeper. The only bit I always succeeded at at school was geometry.

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1. Geometry totally baffled me. It might have just been a difficult time (new school and all) or because I didn’t study hard enough (most likely) or that I’d think I’d know what I was doing and then stop myself. When I started at the new school they wanted to put me in a lower level for geometry and I talked them out of it. I think it was a matter of pride. What can I say? I was 15…

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1. In Poland teaching is different, so you have to achieve certain levels of all the math areas to advance to the next year, so I guess I was kind of “eased” into it. And it was more appealing than, let’s say, trigonometry, as it always had real-life applications. 🙂

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21. I’m impressed – always impressed with the things you come up with for your posts!

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1. I have no idea how I come up with this stuff, but I’m glad you enjot it.

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1. You’re just that amazing, that’s all! Keep running with it!! 🙂

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1. I understood it well enough ton get through Differential Equations, but that was about it.

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