https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&user=162.158.155.170&feedformat=atomexplain xkcd - User contributions [en]2021-03-06T14:24:19ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=Talk:184:_Matrix_Transform&diff=174218Talk:184: Matrix Transform2019-05-17T13:07:51Z<p>162.158.155.170: orientation</p>
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<div>This baby needs a bit more rigor. --[[User:Quicksilver|Quicksilver]] ([[User talk:Quicksilver|talk]]) 05:23, 24 August 2013 (UTC)<br />
[[Special:Contributions/173.245.62.84|173.245.62.84]] 07:54, 7 April 2014 (UTC)<br />
I think this is also a reference to the movie "The Matrix", specifically the now famous scene where Neo does 90degree back bending to dodge bullets.<br />
[[Special:Contributions/173.245.62.84|173.245.62.84]] 07:54, 7 April 2014 (UTC)<br />
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Maybe another reference: <br />
They'll go home (translation matrix) and shrink (scale matrix). Translation, scale and rotate are probably the most popular linear transformations.<br />
[[Special:Contributions/108.162.218.89|108.162.218.89]] 23:39, 14 May 2014 (UTC)<br />
<br />
I've been teach that the rotation was anticlockwise. Do computer turn the other way round that math teachers?<br />
by the way (left ( matrix{0 # 1 ## -1 # 0} right )*left ( binom 1 0 right)=left (binom 0 1 right) if you know what i mean.<br />
get fun.<br />
[[User:Yomismo|Yomismo]] ([[User talk:Yomismo|talk]]) 09:28, 18 March 2015 (UTC)<br />
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Iiiii'm pretty sure the "shrink" is a typo, and he meant "drink". My evidence is the xkcd book, where he just flat-out says it.<br />
<br />
On clockwise/counterclockwise: I think Randall is using screen coordinates (where the top left is (0,0) and the point (1,4) is one below (1,3)), instead of standard Cartesian coordinates where the bottom left is (0,0) and going from (1,3) to (1,4) means going upwards. [[Special:Contributions/162.158.155.170|162.158.155.170]] 13:07, 17 May 2019 (UTC)</div>162.158.155.170https://www.explainxkcd.com/wiki/index.php?title=2034:_Equations&diff=1613122034: Equations2018-08-17T06:40:39Z<p>162.158.155.170: </p>
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<div>{{comic<br />
| number = 2034<br />
| date = August 17, 2018<br />
| title = Equations<br />
| image = equations.png<br />
| titletext = All electromagnetic equations: The same as all fluid dynamics equations, but with the 8 and 23 replaced with the permittivity and permeability of free space, respectively.<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by a BOT - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
{| class="wikitable"<br />
!style="width:20%"|Equation<br />
!style="width:20%"|Field<br />
!style="width:60%"|Explanation<br />
|-<br />
|<math>E = K_0t + \frac{1}{2}\rho vt^2</math><br />
|ALL KINEMATICS EQUATIONS<br />
|Energy equals a constant K_0 multiplied by time plus half of density multiplied by speed multiplied by time squared<br />
|-<br />
|<math>K_n = \sum_{i=0}^{\infty}\sum_{\pi=0}^{\infty}(n-\pi)(i-e^{\pi-\infty})</math><br />
|ALL NUMBER THEORY EQUATIONS<br />
|<br />
|-<br />
|<math>\frac{\partial}{\partial t}\nabla\cdot p = \frac{8}{23}<br />
\int\!\!\!\!\int\!\!\!\!\!\!\!\!\!\!\!\!\!\!\;\;\;\bigcirc\,\,<br />
\rho\,ds\,dt\cdot \rho\frac{\partial}{\partial\nabla}<br />
</math><br />
|ALL FLUID DYNAMIC EQUATIONS<br />
|-<br />
|<math>|\psi_{x,y}\rangle = A(\psi) A(|x\rangle \otimes |y\rangle)</math><br />
|ALL QUANTUM MECHANIC EQUATIONS<br />
|<br />
|-<br />
|<math>\mathrm{CH}_4 + \mathrm{OH} + \mathrm{HEAT} \rightarrow \mathrm{H}_2\mathrm{O} + \mathrm{CH}_2 + \mathrm{H}_2 \mathrm{EAT}</math><br />
|ALL CHEMISTRY EQUATIONS<br />
| the combustion of methane often taught and good example problem but obviously there are more chemistry problems than the combustion of methane.<br />
|-<br />
|<math>SU(2)U(1) \times SU\left(U(2)\right)</math><br />
|ALL QUANTUM GRAVITY EQUATIONS<br />
|<br />
|-<br />
|<math>S_g = \frac{-1}{2\bar{\epsilon}}i\eth \hat{\big(} \zeta_0 \dotplus p_\epsilon \rho_v^{abc}\cdot \eta_0 \hat{\big)} f_a^0 a\lambda(\xi) \psi(0_a)</math><br><br />
|ALL GAUGE THEORY EQUATIONS<br />
|<br />
|-<br />
|<math>H(t) + \Omega + G \cdot \Lambda \, \dots \begin{cases} \dots > 0 & \text{(HUBBLE MODEL)} \\ \dots = 0 & \text{(FLAT SPHERE MODEL)} \\ \dots < 0 & \text{(BRIGHT DARK MATTER MODEL)} \end{cases}<br />
</math><br />
|ALL COSMOLOGY EQUATIONS<br />
|<br />
|-<br />
|<math>\hat H - \mu_{0} = 0</math><br />
|ALL TRULY DEEP PHYSICS EQUATIONS<br />
|<br />
|}<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
[TODO: Avoid using math markup here because the images of these equations isn't helpful in a transcript. Sigh.]<br />
[Nine equations are listed and labeled as followed:]<br />
<br><br><br />
E = K<sub>0</sub>t + 1/2 pvt<sup>2</sup><br><br />
ALL KINEMATICS EQUATIONS<br><br />
<br><br />
<math>K_n = \sum_{i=0}^{\infty}\sum_{\pi=0}^{\infty}(n-\pi)(i-e^{\pi-\infty})</math><br><br />
ALL NUMBER THEORY EQUATIONS<br><br />
<br><br />
<math>\frac{\partial}{\partial t}\triangledown\cdot p = \frac{8}{23}<br />
\int\!\!\!\!\int\!\!\!\!\!\!\!\!\!\!\!\!\!\!\;\;\;\bigcirc\,\,<br />
\rho\,ds\,dt\cdot \rho\frac{\partial}{\partial\triangledown}<br />
</math><br><br />
ALL FLUID DYNAMIC EQUATIONS<br><br />
<br><br />
<math>|\psi_{x,y}\rangle = A(\psi) A(|x\rangle \otimes |y\rangle)</math><br><br />
ALL QUANTUM MECHANIC EQUATIONS<br><br />
<br><br />
CH<sub>4</sub> + OH + HEAT &rarr; H<sub>2</sub>O + CH<sub>2</sub> + EAT <br><br />
ALL CHEMISTRY EQUATIONS<br><br />
<br><br />
SU(2)U(1) &times; SU(U(2)) <br><br />
ALL QUANTUM GRAVITY EQUATIONS<br><br />
<br><br />
<math>S_g = \frac{-1}{2\epsilon}i\eth \hat{\big(} \zeta_0 \dotplus p_\epsilon \rho_v^{abc}\cdot \eta_0 \hat{\big)} f_a^0 a\lambda(\zeta) \psi(0_a)</math><br><br />
ALL GAUGE THEORY EQUATIONS<br><br />
<br><br />
<math>H(t) + \Omega + G \cdot \land \, ... \begin{cases} ... > 0 & \text{(HUBBLE MODEL)} \\ ... = 0 & \text{(FLAT SPHERE MODEL)} \\ ... < 0 & \text{(BRIGHT DARK MATTER MODEL)} \end{cases}<br />
</math><br><br />
ALL COSMOLOGY EQUATIONS<br><br />
<br><br />
&#x0124; - u̧<sub>0</sub> = 0<br><br />
ALL TRULY DEEP PHYSICS EQUATIONS<br />
<br><br />
<br />
<br />
{{comic discussion}}<br />
[[Category:Math]]</div>162.158.155.170https://www.explainxkcd.com/wiki/index.php?title=Talk:2033:_Repair_or_Replace&diff=161276Talk:2033: Repair or Replace2018-08-16T14:14:49Z<p>162.158.155.170: </p>
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<div><!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--><br />
Do I have to make a backup of ALL my friends and family? [[Special:Contributions/162.158.122.66|162.158.122.66]] 16:33, 15 August 2018 (UTC)<br />
:Yes, in the cloud... --[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 16:41, 15 August 2018 (UTC)<br />
:: Which reminds me on: http://tardis.wikia.com/wiki/Nethersphere [[User:Elektrizikekswerk|Elektrizikekswerk]] ([[User talk:Elektrizikekswerk|talk]]) 08:28, 16 August 2018 (UTC)<br />
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I’ll just “forget” to backup ms sister, hehehe [[Special:Contributions/162.158.74.225|162.158.74.225]] 16:35, 15 August 2018 (UTC)<br />
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Given the number of stories on TFTS about users who don't actually know what "backup" means, this is either a really bad idea or a really good idea. [[Special:Contributions/162.158.75.46|162.158.75.46]] 17:21, 15 August 2018 (UTC)<br />
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It's rather nonsensical when you're talking about things from the same generation, but James May, in his book The Reassembler, made a good argument against fixing old things - old things made for a time when things were expensive and had to be built to last, which meant making them easy to repair when they broke down (which happened frequently) - new things are more reliable and require repair far less often than the products of old, and attempting to repair old things diverts energy away from new innovations, thus holding humanity back. No sense trying to repair an old Nokia 5110 when even the cheapest smartphone from Wish will run rings around it and last longer anyway. [[Special:Contributions/108.162.250.11|108.162.250.11]] 00:29, 16 August 2018 (UTC)<br />
:Well, the old Nokias are indestructible anyways, so you wouldn't even be ''able'' to open the case and repair it. [[Special:Contributions/162.158.91.59|162.158.91.59]] 09:14, 16 August 2018 (UTC)<br />
:Depends. The Nokia 5110 has a stand-by-time of 150h – show me a smartphone that has something like this ;-). --[[User:DaB.|DaB.]] ([[User talk:DaB.|talk]]) 13:54, 16 August 2018 (UTC)<br />
:I remember trying to break my old Nokia 1611 so I could get a new one on "insurance". Used it to play fetch with the dog, threw it against a brick wall, jumped up and down on it wearing army boots. The damned thing would not break. Compare that to a modern smartphone that bricks if you look at it wrong. [[Special:Contributions/162.158.155.170|162.158.155.170]] 14:14, 16 August 2018 (UTC)<br />
<br />
Thank goodness, when I get rid of an old car the next owner can't log into it and review every single place I drove and every conversation I had while driving it... that's coming, though. :( [[User:MaineGrammy|MaineGrammy]] ([[User talk:MaineGrammy|talk]]) 09:19, 16 August 2018 (UTC)</div>162.158.155.170https://www.explainxkcd.com/wiki/index.php?title=2022:_Sports_Champions&diff=1602572022: Sports Champions2018-07-20T05:27:35Z<p>162.158.155.170: /* Explanation */ player</p>
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<div>{{comic<br />
| number = 2022<br />
| date = July 20, 2018<br />
| title = Sports Champions<br />
| image = sports_champions.png<br />
| titletext = For a long time, people thought maybe Usain Bolt was the one for running, until the 2090s and the incredible dominance of Derek Legs.<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by a CHAMPION - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
<br />
In an example of {{w|Nominative determinism}}, the cartoon lists people whose surname relates to their participation in various sports.<br />
<br />
{| class="wikitable"<br />
!style="width:20%"|Name<br />
!style="width:10%"|Year<br />
!style="width:70%"|Explanation<br />
|-<br />
|Margaret Court<br />
|1960s<br />
|{{w|Margaret Court}} is a real Australian tennis player, former world number 1, who won many competitions in the 1960s and 70s. A {{w|tennis court}} is the playing arena used in that sport.<br />
|-<br />
|Gary Player<br />
|1970s<br />
|{{w|Gary Player}} is a real South African golf player who won nine major championships in the 1960s and 70s. Game contestants are often known as "players".<br />
|-<br />
|Lonzo Ball<br />
|2020s<br />
|<br />
|-<br />
|Jake Halfpipe<br />
|2030s<br />
|<br />
|-<br />
|Sarah Goggles<br />
|2030s<br />
|<br />
|-<br />
|Julia Chairlift<br />
|2050s<br />
|<br />
|-<br />
|Dwight Shuttlecock<br />
|2060s<br />
|<br />
|-<br />
|Brandon Sponsorship<br />
|2060s<br />
|<br />
|-<br />
|Kate Dopingscandal<br />
|2070s<br />
|<br />
|-<br />
|Jebediah Disasterous Postgame PressConference<br />
|2080s<br />
|<br />
|}<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
<br />
{{comic discussion}}</div>162.158.155.170