Recent comments in /f/explainlikeimfive
macedonianmoper t1_j6b9mpy wrote
Reply to comment by Genshed in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
Ah I see, then it's totally understandable, unlike fractions and negatives they don't really serve a purpose for day to day.
Education changes from place to place, I see a lot of people apparently had calculus in highschool while I only started it in college (this was only a few years ago), I did however learn about imaginary numbers in high school
zachtheperson t1_j6b9875 wrote
Imaginary numbers become useful when working with a lot of advanced mathematics, and make equations work nicely.
A simple example though, is square rooting a negative number as you mentioned, but there's a little more to it. square_root(-1) = i, but that doesn't mean "no solution possible," it means that it's not possible at that moment. For example, if I plug that result into the function "f(x)=2+x^(2)" it now becomes a valid answer, because I am squaring the "impossible," answer of square_root(-1), cancelling out the square root
jrhooo t1_j6b8h32 wrote
Reply to comment by Antman013 in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Im going to have to try the Van Gogh. If you ever get around to it, you might appreciate effen as well. They do a few flavon infused, but their straight vodka is smooth and clean
sweetnumb t1_j6b8b4o wrote
Reply to comment by Antman013 in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Yes... I agree with you. Overhyped by rappers.
sweetnumb t1_j6b881z wrote
Reply to comment by chapstick__ in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Oh wow, you're right. Somehow I completely forgot about that.
Antman013 t1_j6b868t wrote
Reply to comment by jrhooo in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
My two favourites are Van Gogh Triple Wheat (Dutch), and Chopin Wheat. There is a craft distillery a couple hours away from me that uses Red Fife Wheat for their Vodka and Gin that I like VERY much, particularly as the first two are not stocked at my local LCBO.
chapstick__ t1_j6b8307 wrote
Reply to comment by sweetnumb in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
It's not possible to make tequila in Boston because that would be mezcal. Tequila has to come from tequila Mexico to be tequila.like how bourbon has to come from bourbon Kentucky. Boston probably just doesn't have very good tequila at bars.
[deleted] t1_j6b7z5m wrote
Reply to comment by sweetnumb in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
[deleted]
Antman013 t1_j6b7uqj wrote
Reply to comment by jrhooo in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Agree with you on Chopin Wheat. That is the one that led me to Triple Wheat by Van Gogh, which is just awesome.
Genshed t1_j6b7ngm wrote
Reply to comment by macedonianmoper in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
I can't imagine an engineering degree I could have done.
Background: I went to high school in the late 1970s. We had geometry (Euclid style, not Descartes) and an algebra class for the students who were going to university.
Took an accelerated trigonometry class during summer bridge, and then failed Calculus I three times my freshman year.
That's when I shifted my academic goals from the natural sciences to history. I still retain my youthful enthusiasm for the sciences, which is why I learned about complex numbers in the first place.
Most of my friends view my ongoing efforts to understand mathematics as a charming eccentricity. As my eldest brother put it, paraphrasing Oscar Wilde, 'all logarithms are quite useless.'
Antman013 t1_j6b7hbg wrote
Reply to comment by sweetnumb in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Grey Goose is literally about marketing. The guy behind it spent thousands on slanted "surveys" where Grey Goose was compared against "well stock" brands, so naturally it would be the favourite. That led to the marketing campaign where the surveys were used as "proof" that it was the "best Vodka in the world". You can look up the history of it all. It;s a dang case study in marketing strategy.
macedonianmoper t1_j6b7etg wrote
Reply to comment by Tharsis101 in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
He understood, the thing is that the square root of a negative number is only impossible if you exclude "imaginary" numbers as a solution.
Very much like saying 3-6 is impossible if you don't think negative numbers are possible.
Just like banks might need negative numbers to say you're in debt, imaginary numbers are useful for other things, engineers use it to describe electricity in AC circuits for example
So you can say that imaginary numbers aren't possible, but that excludes real solutions that help you solve problems, very much like excluding fractional numbers would stop you from sharing an apple with a friend since you can either have an entire apple or none at all
[deleted] t1_j6b7bno wrote
Reply to ELI5: How does surgery on tendons work? by RaphaelRhyss
[removed]
extacy1375 t1_j6b6ecg wrote
Reply to comment by sweetnumb in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
I always read about it....never tried.
I dont like any alcohol... especially non clear ones. Unless in a mixed drink. Tito's I can drink straight....without making that face....lol
gwaydms t1_j6b63rb wrote
Reply to comment by robot_socks in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
We didn't learn imaginary numbers until Algebra 1. Not a lot of us took that in Jr hi. Well, I did, but the excellent teacher we had went to teach at the high school, so we got the world's worst Algebra teacher. I'd ask her a question and be more confused afterward, so I learned to figure things out on my own. I felt bad for the kids who couldn't do that and got no help from our very nice but clueless teacher.
macedonianmoper t1_j6b5xnw wrote
Reply to comment by Genshed in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
What did you take then? I can't imagine an engineering degree that wouldn't use them, especially if you have any classes on anything electrical
DigitalSteven1 t1_j6b5gst wrote
Reply to comment by Genshed in ELI5: Why do imaginary numbers even need to exist? by Tharsis101
We learned about them in like 9th grade. Times change. The mathematics being taught in high school now was university level a decade or two ago.
chopstyks t1_j6b586x wrote
Reply to comment by PrionBacon in eli5: what is morning breath & why is it so relentless by [deleted]
How insightful.
...checks username
That's some insider knowledge.
TheNoidedAndroid t1_j6b4dly wrote
Two positive numbers can't multiply together to create a negative number, so it should be impossible.
But... if you 'imagine' that there IS some number that is multiplied by itself to get a negative number, you can actually use that 'imaginary' number to get useful results. All we do is define that number explicitly, so you say i*i= -1.
From this you get:
i^1 = i
i^2 = -1
i^3 = -i
i^4 = 1
A 'Complex number' is the sum of imaginary number and a real number. (for example 3i - 1) The complex plain is a coordinate system that plots complex numbers using the imaginary component for one axis and the real component for the other axis.
If you're using a regular x/y coordinate system, you can easily move the point on the X axis by adding or subtracting from the x value, and you can move the point on the Y axis by adding or subtracting from the y value, but what if you want to do something like rotating the coordinate around the origin? It's not super straight forward to find an operation that will turn 3x-y to -3y-x that will work for all coefficients. Sure, you could just add -4x -2y, but that only works for those specific coordinates.
But if you're using a complex plain, you unlock another operation! You can rotate the coordinate around (0,0) simply by multiplying it by some power of i!
Multiplying by 'i' rotates the coordinate 90 degrees clockwise, multiplying by i^x rotates the coordinate by 90*x degrees.
i^4 = i*i*i*i = (-1)(-1) = 1 because you've completed the 360 degree rotation returning the coordinate to where it started.
So if you're using 3i-1 instead of 3x-y, you can easily rotate it.
(3i-1) * i
3(i*i) - i
3(-1) -i
-3-i
And this operation will work regardless of what your starting coordinates are. Say you want to rotate -9i -5 by 270 degrees, you just multiply by i^3.
(-9i -5) * i^3
(-9i * i^3) + (-5 * i^3)
(-9i^4) + (-5i^3)
(-9 1) + (-5-i)
5i-9
sweetnumb t1_j6b490x wrote
Reply to comment by Diagonalizer in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
That's weird to me. I like Grey Goose significantly more than Tito's. I associate Tito's with "not terrible like Popov, but not great like Belvedere." It's definitely acceptable... but that's all I can say on it.
jakeallstar1 t1_j6b4639 wrote
Reply to comment by popejubal in ELI5: Why do US cops in press conferences always have a dozen useless people standing behind them? by rock_monkeys
Have you guys learned nothing? Looking like you're doing the job is far more important than actually doing the job. This is true in all but the bluest of blue collar jobs. And it gets truer the whiter your collar is.
Shaman7102 t1_j6b4319 wrote
Reply to ELI5: How does surgery on tendons work? by RaphaelRhyss
Had rotator cuff repair x2 on left shoulder. First surgery used the pin method and failed. Second surgeon used a thread anchor through bone technique much less painful and much happier with results. Takes a full year to heal to 100% but will never be as strong as original.
sweetnumb t1_j6b429t wrote
Reply to comment by Antman013 in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Grey Goose has been overhyped by rappers, sure. But it's really pretty good. Granted, I'd take Belvedere all day every day over Grey Goose, but if someone is offering Grey Goose I'm definitely not complaining.
is_only_joke t1_j6b41sq wrote
Reply to comment by Adventurer_By_Trade in ELI5 Why do men pee in solid streams and women more or less gush out their pee? by Kaz3girl4
Might be a skill issue
blkhatwhtdog t1_j6ba72i wrote
Reply to comment by lewisj75 in eli5: Why does cheap alcohol taste worse than nicer alcohol? by Chase_The_Dream
Easy just look at the ingredients on the nutritional label. Case closed, thanks for playing.