## Search found 148 matches

- Tue Dec 12, 2017 12:24 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1927: "Tinder"
- Replies:
**18** - Views:
**2243**

### Re: 1927: "Tinder"

LTRs are useful in dating retroviral insertions. I don't actually know how many retriviral insertions found each other on Tinder, but I assume some of them did! LTRs are useful in dating retroviral insertions. I don't actually know how many retriviral insertions found each other on Tinder, but I as...

- Thu Oct 19, 2017 4:06 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1904: Research Risks
- Replies:
**62** - Views:
**5197**

### Re: 1904: Research Risks

Heimhenge wrote:

Just sayin' ... I've seen better Randall graphs.

I think that this viewpoint would be better justified with an appropriate illustration of the relative data points in question, perhaps in graph format?

- Mon Sep 25, 2017 6:59 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1894: "Real Estate"
- Replies:
**28** - Views:
**3090**

### Re: 1894: "Real Estate"

"Thing" units are fine for smaller items, but when dealing with amounts that you will probably finance, it's best to convert money units into time units. "years of salary", "years of net savings", "years of working a second job"... stuff like that. Of course ...

- Mon Sep 18, 2017 5:30 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1891: "Obsolete Technology"
- Replies:
**63** - Views:
**6478**

### Re: 1891: "New Technology"

If it ain't broke, don't fix it. If it is broke, fix it only as much as is necessary. Unfortunately, this attitude can lead to situations where people are complacent and don't realize that something actually is broken, but not in an obvious way. Case in point: Light bulbs. For their primary functio...

- Mon Aug 28, 2017 7:41 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1882: "Color Models"
- Replies:
**81** - Views:
**8610**

### Re: 1882: "Color Models"

I can't believe we're this far in without anyone mentioning https://blog.xkcd.com/2010/05/03/color-survey-results/

- Mon Nov 21, 2016 9:22 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1761: "Blame"
- Replies:
**138** - Views:
**23789**

### Re: 1761: "Blame"

Alice and Bob are nominally friends. Alice is always a super nice person who doesn't do anything to attack or hurt people. Bob thus far hasn't really done much of exceptional note against Alice, so Alice, nice person that she is, is friendly with Bob. Then one day Bob reveals himself to be a jackas...

- Tue Nov 08, 2016 1:51 am UTC
- Forum: General
- Topic: How long has this been on xkcd comics?
- Replies:
**3** - Views:
**2485**

### How long has this been on xkcd comics?

So I just noticed this at the bottom of today's xkcd...so I went back and looked at others. Has it always been there and I never noticed, or is it something that is new(ish)? xkcd.com is best viewed with Netscape Navigator 4.0 or below on a Pentium 3±1 emulated in Javascript on an Apple IIGS at a sc...

- Sat Nov 05, 2016 3:51 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1755: "Old Days"
- Replies:
**37** - Views:
**6056**

### Re: 1755: "Old Days"

And of course, this brings to mind an old Frank Hayes classic, this rendition by Tom Smith: https://tomsmith.bandcamp.com/track/when-i-was-a-boy

- Tue Oct 25, 2016 2:43 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1750: "Life Goals"
- Replies:
**47** - Views:
**8543**

### Re: 1750: "Life Goals"

ganof wrote:Apparently I'm not the only one https://www.google.ca/trends/explore?q=zymurgy

Hmm, any clue what caused/correlated that spike in the week of April 10-16 when it went up to 100?

- Tue Oct 25, 2016 2:41 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1750: "Life Goals"
- Replies:
**47** - Views:
**8543**

### Re: 1750: "Life Goals"

Ah, syzygy. That was always my go-to word in Hangman. It covers my two favorite things: astronomy and completely taking the fun out of every game I play. Have not been punched yet. Damn you, I did a literal spit take at computer I'm sitting at monitoring my class take a lab at this.....fortunately ...

- Wed Oct 12, 2016 12:05 am UTC
- Forum: Mathematics
- Topic: Math Books
- Replies:
**378** - Views:
**233676**

### Re: Math Books-Banach Lattices

I'm trying to learn about Banach Lattices (Riesz spaces which are Banach Spaces). The textbook my professor gave me to work from is Peter Meyer-Nieberg's "Banach Lattices", 1st edition, 1991. I'm finding it extremely dense/hard to follow. (I didn't have any problem with Kreyszig's Introduc...

- Sat Oct 08, 2016 11:29 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1743: "Coffee"
- Replies:
**77** - Views:
**12705**

### Re: 1743: "Coffee"

I'm on episode 11 of Luke Cage, so I thought this title might refer to something COMPLETELY different....

- Fri Sep 02, 2016 9:30 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1727: "Number of Computers"
- Replies:
**35** - Views:
**6680**

### Re: 1727: "Number of Computers"

Pfhorrest wrote:Farabor wrote:Growing up, I naively thought we'd just use the sun for that.

Turns out it's actually easier to hurl things into Jupiter than it is the sun.

So I learned later in life, thus the 'naively' part of the original statement

- Wed Aug 31, 2016 6:19 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1727: "Number of Computers"
- Replies:
**35** - Views:
**6680**

### Re: 1727: "Number of Computers"

bondsbw wrote:I'm beginning to suspect that using Jupiter as a general waste management strategy may not be as efficient as they said it would be.

Growing up, I naively thought we'd just use the sun for that.

- Mon Jul 11, 2016 11:46 pm UTC
- Forum: What If?
- Topic: What-If 0150: "Tatooine Rainbow"
- Replies:
**52** - Views:
**28335**

### Re: What-If 0150: "Tatooine Rainbow"

Great. Now all we have to do is to get it to rain on Tatooine. In the Earthly Tataouine in Tunisia where that part of Star Wars was shot the annual rainfall averages 134 mm. This is nothing like as dry as the Atacama Desert in Chile, with an average rainfall of 15 mm per year. Some locations there ...

- Tue Jun 28, 2016 6:35 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1699: "Local News"
- Replies:
**27** - Views:
**5598**

### Re: 1699: "Local News"

City Council elections? Pah! We've just had a referendum to set government policy and apparently accidently triggered the Rapture. I thought the whole point of the thing was to throw Westminster into complete chaos with no tenable candidates for Prime Minister so that HM would ask Larry the Downing...

- Wed Apr 13, 2016 5:12 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1667: "Algorithms"
- Replies:
**49** - Views:
**9471**

### Re: 1667: "Algorithms"

I have a compsci friend who's often griped about people misusing excel for things that it's not suited for

- Thu Mar 10, 2016 5:25 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1653: "United States Map"
- Replies:
**106** - Views:
**16413**

### Re: 1653: "United States Map"

Is it wrong that the first thing I thought of was to search for fixed points, before I realized that the translation function wasn't continuous and therefore Brouwer's FIxed Point theorem doesn't apply? On the "land noone wants", in slightly fictional lands, there was the reason for Pennsi...

- Fri Nov 13, 2015 5:09 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1602: Linguistics Club
- Replies:
**117** - Views:
**19740**

### Re: 1602: Linguistics Club

Sadly, there's actually a semi-common use of the sesqui- prefix in my line of work: Sesquilinear forms, which are linear in the first component and conjugate linear in the second. Go figure!

- Wed Sep 16, 2015 10:23 pm UTC
- Forum: Science
- Topic: Europeans traveling to the Americas in history: Diseases?
- Replies:
**9** - Views:
**2162**

### Europeans traveling to the Americas in history: Diseases?

So, I was listening to NPR today talk about the canonization of a spanish missionary to the new world, and they brought up the topic of all of the natives killed by European diseases that they had no resistances built up to. Strangely enough, today was the first time I wondered about the symmetric s...

- Tue Dec 09, 2014 4:27 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1457:"Feedback"
- Replies:
**23** - Views:
**6915**

### Re: 1457:"Feedback"

You place it, however it needs to be orientated, in the window. After that, no touchie! Tethering is now your best friend. You're assuming the router is orientable...... (Okay, I've been doing too much topology lately. Anyone want the first homotophy group of a sphere adjoined to a circle by a sing...

- Mon Nov 10, 2014 1:50 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1445: "Efficiency"
- Replies:
**40** - Views:
**10860**

### Re: 1445: "Efficiency"

http://imgs.xkcd.com/comics/efficiency.png Title Text: I need an extension for my research project because I spent all month trying to figure out whether learning Dvorak would help me type it faster. The fact that stategies A and B are equally worthwhile reminded me of Buridan's ass . This is the f...

- Mon Oct 13, 2014 4:28 pm UTC
- Forum: Mathematics
- Topic: Question about 1+2+3+4...=-1/12 (please hear me out)
- Replies:
**24** - Views:
**6054**

### Re: Question about 1+2+3+4...=-1/12 (please hear me out)

To turn the question around on you....what value would making this definition have? Anytime we add a definition to something, we generally do it because it is useful/leads to greater insights/etc. Regardless on the methodology, this 'result' seems to be valueless.

- Mon Oct 06, 2014 10:43 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1430: "Proteins"
- Replies:
**81** - Views:
**14221**

### Re: 1430: Proteins

Anyone up to explaining the alt text to those of us who are biology and/or origami impaired?

- Tue Sep 09, 2014 2:30 am UTC
- Forum: Mathematics
- Topic: (homework) Finite additivity problem
- Replies:
**2** - Views:
**1761**

### Re: (homework) Finite additivity problem *Solved, thanks*

Doh, that's it exactly! Thanks.

- Tue Sep 09, 2014 1:14 am UTC
- Forum: Mathematics
- Topic: (homework) Finite additivity problem
- Replies:
**2** - Views:
**1761**

### (homework) Finite additivity problem

This is for a graduate level mathematical probability course. So, to make my life easier, I'm going to Romanize all the greek letters here. Starting with a countably infinite set X, take the collection F of all subsets A of X such that either A or A-complement is finite. We define a set function P(E...

- Wed Sep 03, 2014 2:13 am UTC
- Forum: Language/Linguistics
- Topic: What is the incorrect answer to this question?
- Replies:
**8** - Views:
**4460**

### Re: What is the incorrect answer to this question?

My advice for a reference on this and many other beautiful concepts is a book everyone should read: Gödel, Escher, Bach: An Eternal Golden Braid." Go get it, now. It addresses, amongst other things, paradoxes and self reference quite well.

(On a side note, I love the Gödel filter here!)

(On a side note, I love the Gödel filter here!)

- Tue Sep 02, 2014 11:30 am UTC
- Forum: Mathematics
- Topic: Is there a notation for unit vectors?
- Replies:
**6** - Views:
**2202**

### Re: Is there a notation for unit vectors?

Flumble wrote:

Luckily, with math, everything is defineable:

Oh really? http://en.wikipedia.org/wiki/Definable_real_number

*whistle*

- Fri Aug 29, 2014 9:40 pm UTC
- Forum: Mathematics
- Topic: isotonic vs monotonic?
- Replies:
**2** - Views:
**2016**

### isotonic vs monotonic?

I just encountered a professor using the term 'isotonic' in class. From my brief forays online, it seems to be either the exact same as monotonic, or something very close to it. Is there any difference in these terms?

- Fri Aug 29, 2014 3:25 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1414: "Writing Skills"
- Replies:
**86** - Views:
**16449**

### Re: 1414: "Writing Skills"

Malcolm Gladwell talks about the 10,000-hour rule in his book "Outliers." (Ten thousand hours of practice doing something makes it more than likely you'll be a virtuoso at that thing.) The question is, are kids today virtuosos at writing or at writing poorly? Hmm. . Disregarding the sourc...

- Fri Aug 29, 2014 3:17 pm UTC
- Forum: Mathematics
- Topic: Irrational to the irrational=rational
- Replies:
**5** - Views:
**2259**

### Re: Irrational to the irrational=rational

I'm glad I posted this, as the discussion above has proved useful and interesting!

**Spoiler:**

- Thu Aug 28, 2014 1:40 am UTC
- Forum: Mathematics
- Topic: Irrational to the irrational=rational
- Replies:
**5** - Views:
**2259**

### Irrational to the irrational=rational

I don't know if this is a well known result or not, but someone just showed me a neat, simple proof of the existence of two irrational real numbers x and y such that x^y is rational. Thought I'd share the question here for those who might not have seen it to try it out. As an existence proof, it of ...

- Mon Jun 23, 2014 3:50 am UTC
- Forum: Mathematics
- Topic: The Most Important Math
- Replies:
**48** - Views:
**17978**

### Re: The Most Important Math

The answer is clearly logic. Proof: Every argument in this thread uses logic to justify its truth. Thus logic is the essential underpinning of everything :) I'm with Farabor. Math is based on the idea that logic is... well, logical. E.g. axioms in any field of mathematics are statements that are co...

- Sat Jun 21, 2014 12:39 am UTC
- Forum: Mathematics
- Topic: The Most Important Math
- Replies:
**48** - Views:
**17978**

### Re: The Most Important Math

The answer is clearly logic. Proof: Every argument in this thread uses logic to justify its truth. Thus logic is the essential underpinning of everything

- Fri Jun 13, 2014 10:24 pm UTC
- Forum: School
- Topic: Title for grad student teaching a class?
- Replies:
**16** - Views:
**11659**

### Title for grad student teaching a class?

Well, I'm a Graduate Teaching Assistant in mathematics at my local university. Starting in the fall I'll be teaching a course full time. I'm caught debating what to have the students call me. Mr.? Professor? First name?

- Wed May 28, 2014 10:50 am UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1374: "Urn"
- Replies:
**91** - Views:
**16098**

### Re: 1374: "Urn"

orthogon wrote:What's an imaginary urn?

A real urn times i, of course.

- Fri May 16, 2014 9:52 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1369: TMI
- Replies:
**51** - Views:
**16269**

### Re: 1369: TMI

Just remember, TMI is a TLI, not a TLA.

(Just like TLA is actually a TLI, not a TLA. Pedants FTW!)

(Just like TLA is actually a TLI, not a TLA. Pedants FTW!)

- Sat May 10, 2014 3:16 am UTC
- Forum: Mathematics
- Topic: Second order differential equations - why doesn't this work?
- Replies:
**5** - Views:
**2158**

### Re: Second order differential equations - why doesn't this w

As a minor note: c 1 e ax +c 2 e ax = b 1 cosh(ax) + b 2 sinh(ax) As long as a is real. You can convert from to the other just using algebra. If a is imaginary, you get sin/cos instead. As an alternate approach, you can write y'' - y = 0 as an equation of the form (D^2 - 1)y = 0, where D = d/dx to ...

- Sat May 10, 2014 3:10 am UTC
- Forum: Mathematics
- Topic: How to augment mathematical education?
- Replies:
**7** - Views:
**3039**

### Re: How to augment mathematical education?

Since you have time on your hands, I'd recommend reading "Gödel, Escher, Bach: An Eternal Golden Braid". It's an amazing work that, among other things, will walk you through parts of the foundational crisis in mathematics and Gödel's incompleteness theorem. (On a side note, I love that the...

- Tue May 06, 2014 12:19 am UTC
- Forum: Mathematics
- Topic: Text advice requested: Multivariable Analysis
- Replies:
**3** - Views:
**2011**

### Re: Text advice requested: Multivariable Analysis

I just looked at that link, and it looks very inappropriate....it seems to presume that I know material that I don't actually know. I'm thinking about that Spivak book, as I liked his "Calculus" that I had in undergraduate analysis.