# pi vs tau vs eta

The current tone of the title text section is inconsistent with the rest of this site. These societies are well known and reputable, yet do not belong to this group.

Today is 6/28, making it Tau Day! To the first commenter here:Saying "pi reflects the long history of mathematics" is an argument from tradition. = \frac{\tau^3 r^5}{4 \cdot 2}\], \[\frac{\tau^3 r^6}{6!!} A few mathematicians argue as to whether to use pi, which is the ratio between a circle's circumference and its diameter, or tau, which is the ratio between a circle's circumference and its radius. = \frac{\tau^2 r^4}{4 \cdot 2}\], \[\frac{2 \tau^2 r^4}{3!!} = \frac{\tau r^2}{2}\], \[\frac{2 \tau^1 r^2}{1!!} Pi vs Tau. Creation date: 2020-07-12. You even mentioned that the only reason we used it was because of primitive measuring tools, which isn't a good reason at all. This may add to the humour (although childishly) for Portuguese-speaking readers, though it is fair to presume that it was not Randall's intention to do so.

~~Drifter 108.162.219.214 (talk) (please sign your comments with ~~~~), The bias is worse than that: From the perspective of π, the discussion is about multiples of π, so (3/2)π (that is 3π/2 = 3τ/4) is indeed the compromise between π and 2π. Most people know π (pi) by the approximation 3.14, but do not know τ (tau) which, by definition, is twice as large as pi. Published on Thursday, June 28, 2012 in Bob Palais classic article π is Wrong! Hi, I've recently been invited to both of these. It is interesting, that suppose pi = 3. the sumerians regarded the circle as being of unit radius when standing in it (such as trignometry and astronomy), giving z6.00 degrees. One of the most useful places for Pi is throughout the unit circle. The whole point of radians was to have a natural, elegant unit rather than an arbitrary one like degrees, but diameterans would be just as bad as degrees. Is it time to remove the Incomplete tag yet? Where else does this wiki say, "Math is hard! = \frac{\tau^4 r^8}{8 \cdot 6 \cdot 4 \cdot 2}\], \[\frac{2 \tau^4 r^8}{7!!} The explainxkcd for 287 says nothing about floating point. In the discussion it has been theorized that Randall used, For an entertaining introduction to the concept of tau, see this. We use circumference/diameter and not circumference/radius because with primitive tools it was so much easier to measure the diameter of a circle than the radius.

Board for discussing number systems, weights and measures, and maths.

For a donation of a single dollar per month you get early access to the posts. On second thoughts, there's no indication that he used Wolfram Alpha; as with, This explanation cannot be complete before someone explains what this actually means, to someone who have never herd of octal expansion before (like me).

Blogger Template by Blogger Widgets Designed For Chethstudios. Much of that was around for Tau Day 2011, however. I am not sure what they do, but I was wondering if there was a benefit to joining or at least putting these on my resume, and if it is worth the initiation fee? Dcoetzee (talk) 06:44, 19 November 2013 (UTC), Wow, this filled up fast.

Fall 2020 Recruitment Are you a Junior or Senior mechanical engineering student in the top 25% of your class with a minimum cumulative GPA of 3.25, or a graduate mechanical engineering student ... Posted Sep 1, 2020, 9:53 PM by Bill Johns ; COE Field/Sports Day Monday, November 24th from 6-9 PM, PTS and ASCE will be hosting Sport Day event. The title text claims that pau can be approximated by e+2, as both values are roughly 4.71 — a similarity that holds little since it requires another irrational constant, e (although knowing the value of pau is somewhat more helpful in remembering e to 2 digits). = \frac{\eta^3 D^5}{4}\], \[\frac{2 \eta^4 D^7}{6!!} Xami (talk) 14:01, 18 November 2013 (UTC), Being τ, tau, is already being expressed in terms of π, pi, it shows bias. The new challenger is Eta (η), which is ½π, effectively the inverse of Tau. e+2 being ~4.71, not ~2.58. In the system of Greek numerals, it has a value of 80.Letters that came from it include the Roman P and Cyrillic П.. Notice that even from the seemingly simple shape of a circle, we can look at it from so many different ways. Also, note that "pau" is the Portuguese word for "stick", as well as, in Brazilian Portuguese, a very common slang for "penis". It's "way too complex" for a reason. Explain octal -- base 8 -- first for integers, then for fractions.

—TobyBartels (talk) 20:50, 18 November 2013 (UTC), I am in favour of just calling it ti(e). Let's compare what happens to all the n-sphere areas and n-ball volumes when we use \(\tau\)-and-radius (\(r\)) vs. \(\eta\)-and-diameter (\(D\)). Bob Palais classic article π is Wrong! = \frac{\tau^4 r^7}{6 \cdot 4 \cdot 2}\], \[\frac{\tau^4 r^8}{8!!} The scripture it comes from doesn't mention the devil.

And since when is advanced trig a college level course? One step above "I'll take my ball and go home!" Mention the similarity to the Feynman point.

The main reason is that the ‘tauists’ don’t get out into the real world all that much, and are facinated by mathematical tricks.

It does not occur in the first 200 digits, but occurs 18 times in the first 10,000 digits. 108.162.218.41 21:41, 31 May 2014 (UTC), Is it worth mentioning that while Tau simplifies circumference calculations from 2*pi*r to tau*r, that it complicates area calculations from pi*r^2 to tau/2*r^2?

In the first 500 digits of the actual octal expansion of pau, we also find that 6666 occurs once, and 666 occurs two other times: (Note that this contains 500 digits after the decimal point.) 9 other strings of 3 digits occur 4 times, namely 164, 362, 521, 644, 432, 730, 43, 216, and 450, and only 573 occurs more often, as it occurs 6 times. In each visualization you can see the first 200 digits after the decimal point for each number. Upon Latinization, the Greek upsilon becomes the English "y" so that the etymology of "cycle" from kuklos is readily seen! = \frac{2 \eta^2 D^4}{3}\], \[\frac{\eta^2 D^5}{5!!} Perhaps February 26th?

199.27.128.66 03:14, 19 November 2013 (UTC). (Live is live :D). You'll get the post two days earlier. David Butler's video shows the surprising uses of Eta, some of which rival Tau AND Pi! However, this is not the case, and was likely due to an error in the computer system used by WolframAlpha; for more details see below.

= \frac{\tau^2 r^3}{2}\], \[\frac{\tau^2 r^4}{4!!} Learning is always beneficial, but the Grey Matters philosophy is that learning can and should be fun. Therefore, if 6666 is counted as two occurrences of 666, it is actually the joint second most common string of three numbers in the first 500 digits. Pi. Nealmcb (talk) 23:22, 19 November 2013 (UTC), Kynde (talk) 15:33, 21 November 2013 (UTC), Note that pau is Catalan for peace, which is a good solution for the pi/tau dispute. --141.101.104.17 16:46, 11 December 2014 (UTC), The number 666 comes from the biblical explanation of alliances that are other than godly: "the number of a man," according to Wikipedia. Randall is suggesting using "pau", which is a portmanteau of "pi" and "tau", as a number situated, appropriately enough, halfway between pi and tau, i.e. Pi, --108.162.237.11 17:39, 24 November 2013 (UTC), 4/3*Pau=Tau, 2/3*Pau=Pi, therefore, It can have a practical use.--ParadoX (talk) 10:57, 4 January 2014 (UTC), Dear DgBrt, Please leave the explain as it is. zN is a sixtywise number. The appearences of the extra factor of 2 comes that Kodegadulo sees from two different sources. It is the difference between a mic (aka "micrometer" http://en.wikipedia.org/wiki/Micrometer ) and a protractor. Why not decide which one is more beautiful? ], where B_2*n is a Bernoulli number! Possibly, Randall used Wolfram|Alpha to calculate the result (he uses it a lot, for example What-if 70: The Constant Groundskeeper or What-if 62: Falling With Helium). Clearly, I also desperately needed to get a life!

= \frac{\eta D^2}{2}\], \[\frac{2 \eta^1 D^2}{1!!} I know it's easy to spot if you look at the start so please just enjoy it and vote without trying to consciously figure it out :), Okay I think we need to finally decide: Pi or Tau? = \frac{2 \tau r^3}{3}\], \[\frac{\eta^1 D^2}{2!!} ), similar to the way summation is used.

The Tau Beta Pi Association (commonly Tau Beta Pi, ΤΒΠ, or TBP) is the oldest engineering honor society and the second oldest collegiate honor society in the United States.It honors engineering students in American universities who have shown a history of academic achievement as well as a commitment to personal and professional integrity.

You can see how even-handed this is: it's (√2)π = τ/(√2). = \frac{\eta^2 D^5}{5 \cdot 3}\], \[\frac{\tau^3 r^5}{4!!} What do you think is the way to go? But of course his number would be inconvenient, as this value does not naturally turn up when working with circles or other mathematical constructs, so there are no commonly used formulas that would use pau. This is not true: IEEE double precision numbers (binary64) are stored internally in binary. Diplomacy in communications standards at work! It is easy to understand … I should try harder 625571b7-aa66-4f98-ac5c-92464cfb4ed8 (talk) 14:41, 14 March 2017 (UTC), http://www.basketball-reference.com/players/g/gasolpa01.html, I used Google News BEFORE it was clickbait, https://www.explainxkcd.com/wiki/index.php?title=1292:_Pi_vs._Tau&oldid=193354. This Mathematica code searches for the pattern 666 in the octal expansion of 1.5 pi: These positions start counting with the leading "4" as position 1. This page was last edited on 13 June 2020, at 05:01. In the first 200 digits of the octal expansion, the sequences 666 and 6666 do occur, twice and once, respectively. David Butler's video showed the importance of right angles, but it also showed how confusing eta would be to teach beginning students when his first definition of it was the ratio of paths argument, which is not only an extremely confusing definition, but it also doesn't even work. I used Google News BEFORE it was clickbait (talk) 14:44, 10 January 2015 (UTC), I would argue the 666 appears twice, and 6666 appears once, and that occurence of 6666 is two more occurances of 666: digits 0 through 3 and 1 through 4.

-- 108.162.219.43 22:52, 29 April 2014 (UTC), Is it possible that this is also a reference to the compromise ATM cell size? Available in a range of colours and styles for men, women, and everyone. I think the previous is an indication that Randall did indeed use Wolfram. This is yet another of Randall's compromise comics. 1250 Bellflower Boulevard, USU-215. But for geometric ratios (which these are), the appropriate mean is generally the geometric mean (hence the name). Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share … = =!

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