https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&user=172.69.33.247&feedformat=atomexplain xkcd - User contributions [en]2022-12-04T22:33:36ZUser contributionsMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=2687:_Division_Notation&diff=2970792687: Division Notation2022-10-20T00:39:05Z<p>172.69.33.247: /* Transcript */ this?</p>
<hr />
<div>{{comic<br />
| number = 2687<br />
| date = October 19, 2022<br />
| title = Division Notation<br />
| image = division_notation_new_2x.png<br />
| imagesize = 235x310px<br />
| noexpand = true<br />
| titletext = Science tip: Scientists hardly ever use the two-dot division sign, and when they do it often doesn't even mean division, but they still get REALLY mad when you repurpose it to write stuff like SALE! ALL SHOES 30÷ OFF!<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by a GROUP OF SCHOOLCHILDREN DIVIDED AMONGST THEMSELVES - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
<br />
This comic pokes fun at some of the ways to write the {{w|Division (mathematics)|division}} operation in math. In this comic, Randall has used A as the dividend (the number being divided) and B as the divisor (the number that A is divided by).<br />
<br />
The first two are respectively the {{w|division sign}} (÷) and {{w|long division}} symbol. (Note: the long division symbol is only used in English-speaking countries). These methods of division are often used by school children as the first ÷ is what people learn when first learning division, and the second long division symbol is usually the first type of long division learned (it's easier to do it visually on paper that way).<br />
<br />
The third line is the way the division is often written in software code. The 4 standard operations in programming usually are +, -, *, /. This one was missing in the first version of the comic. This is most commonly seen in regular mathematics as it somewhat saves space, and is easy to type with the slash key.<br />
<br />
The fourth notation is the way division is written in science, dividend on top line and divided on bottom line. This is the closest format to how a {{w|Fraction|fraction}} would be written. This format would likely only be used in written math, as typing the fraction symbol requires the math markup language.<br />
<br />
The fifth notation uses a negative exponent. The exponent -1 has the same effect as dividing by the base. It can be used to keep an equation on 1 line.<br />
<br />
The final form of notation appears to be not a simple notation for division. Rather, it looks like a definition of a notion of division which is customized to a particular setting. This situation is likely to occur in abstract algebra, where one might have to define what "division" might mean for two elements of a mathematical object such as a group, ring, or magma. One example would be an object G, such that, for two elements A and B of G, "A divided by B" is defined as an element C such that CB=A, or alternatively as an element C such that BC=A. These definitions might differ if multiplication in G is not commutative. Furthermore, if such a C is not unique, a function F(A,B) might have to be chosen to select a unique value for "A divided by B" for each A and B. Thus, the F(A,B) in the comic might not even refer to a uniquely defined operation, but simply to the property of a function F(A,B) that is a valid division operation on G, given some definition of division.<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
:<u>Division notation</u><br />
:A÷B <br />
:B⟌A Schoolchild.<br />
:A/B Software engineer.<br />
:<sup>A</sup>⁄<sub>B</sub> Normal person or Unicode enthusiast.<br />
:A over B Scientist.<br />
:AB<sup>-1</sup> Fancy scientist.<br />
:F(A, B) such that F(G)= (text getting smaller) Oh no, run<br />
<br />
{{comic discussion}}<br />
<br />
[[Category:Math]]<br />
[[Category:Science]]<br />
[[Category:Programming]]<br />
[[Category:Science tip]]</div>172.69.33.247https://www.explainxkcd.com/wiki/index.php?title=2687:_Division_Notation&diff=2970772687: Division Notation2022-10-20T00:30:22Z<p>172.69.33.247: /* Transcript */ fix</p>
<hr />
<div>{{comic<br />
| number = 2687<br />
| date = October 19, 2022<br />
| title = Division Notation<br />
| image = division_notation_new_2x.png<br />
| imagesize = 235x310px<br />
| noexpand = true<br />
| titletext = Science tip: Scientists hardly ever use the two-dot division sign, and when they do it often doesn't even mean division, but they still get REALLY mad when you repurpose it to write stuff like SALE! ALL SHOES 30÷ OFF!<br />
}}<br />
<br />
==Explanation==<br />
{{incomplete|Created by a GROUP OF SCHOOLCHILDREN DIVIDED AMONGST THEMSELVES - Please change this comment when editing this page. Do NOT delete this tag too soon.}}<br />
<br />
This comic pokes fun at some of the ways to write the {{w|Division (mathematics)|division}} operation in math. In this comic, Randall has used A as the dividend (the number being divided) and B as the divisor (the number that A is divided by).<br />
<br />
The first two are respectively the {{w|division sign}} (÷) and {{w|long division}} symbol. (Note: the long division symbol is only used in English-speaking countries). These methods of division are often used by school children as the first ÷ is what people learn when first learning division, and the second long division symbol is usually the first type of long division learned (it's easier to do it visually on paper that way).<br />
<br />
The third line is the way the division is often written in software code. The 4 standard operations in programming usually are +, -, *, /. This one was missing in the first version of the comic. This is most commonly seen in regular mathematics as it somewhat saves space, and is easy to type with the slash key.<br />
<br />
The fourth notation is the way division is written in science, dividend on top line and divided on bottom line. This is the closest format to how a {{w|Fraction|fraction}} would be written. This format would likely only be used in written math, as typing the fraction symbol requires the math markup language.<br />
<br />
The fifth notation uses a negative exponent. The exponent -1 has the same effect as dividing by the base. It can be used to keep an equation on 1 line.<br />
<br />
The final form of notation appears to be not a simple notation for division. Rather, it looks like a definition of a notion of division which is customized to a particular setting. This situation is likely to occur in abstract algebra, where one might have to define what "division" might mean for two elements of a mathematical object such as a group, ring, or magma. One example would be an object G, such that, for two elements A and B of G, "A divided by B" is defined as an element C such that CB=A, or alternatively as an element C such that BC=A. These definitions might differ if multiplication in G is not commutative. Furthermore, if such a C is not unique, a function F(A,B) might have to be chosen to select a unique value for "A divided by B" for each A and B. Thus, the F(A,B) in the comic might not even refer to a uniquely defined operation, but simply to the property of a function F(A,B) that is a valid division operation on G, given some definition of division.<br />
<br />
==Transcript==<br />
{{incomplete transcript|Do NOT delete this tag too soon.}}<br />
:<u>Division notation</u><br />
:A÷B <br />
:B⟌A Schoolchild.<br />
:A/B Software engineer.<br />
:A/B as in unicode ½ Normal person or Unicode enthusiast.<br />
:A over B Scientist.<br />
:AB<sup>-1</sup> Fancy scientist.<br />
:F(A, B) such that F(G)= (text getting smaller) Oh no, run<br />
<br />
{{comic discussion}}<br />
<br />
[[Category:Math]]<br />
[[Category:Science]]<br />
[[Category:Programming]]<br />
[[Category:Science tip]]</div>172.69.33.247https://www.explainxkcd.com/wiki/index.php?title=Talk:2473:_Product_Launch&diff=213741Talk:2473: Product Launch2021-06-19T20:15:50Z<p>172.69.33.247: </p>
<hr />
<div><!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--><br />
Today, June 8, Amazon added a new feature to Ring and Echo devices that would allow them to communicate with similar devices owned by other people, thus sharing the owners' WIFI with each other. Through Amazon's "generosity" they are turning this on by default. No clue as to what the purpose of this feature is? Good or Evil? [https://threatpost.com/amazon-sidewalk-to-sweep-you-into-its-mesh/166581/ https://threatpost.com/amazon-sidewalk-to-sweep-you-into-its-mesh/166581/] [[User:Rtanenbaum|Rtanenbaum]] ([[User talk:Rtanenbaum|talk]]) 15:44, 8 June 2021 (UTC)<br />
<br />
: It's a feature, which is good. It's turned on by default, which is evil. [[Special:Contributions/108.162.215.6|108.162.215.6]] 22:59, 8 June 2021 (UTC)<br />
<br />
Some of the items that turn up with the note "Citation Needed" are hilarious. In this entry, Wiki is asking for a citation to back up the claim that the survival rate for most product launches is 100%. This sort of tag always adds to my enjoyment of these entries [[User:Paradox|Paradox]] ([[User talk:Paradox|talk]]) 13:46, 9 June 2021 (UTC)<br />
:Ahoy, Paradox! I don't think you intended to make your comment so time-stamped (used loadsa ~s as horizontal-rules?), but do revert this edit if you did. Take care if you didn't.<br />
:Otherwise, I agree that ''in moderation'' the Citation tag works. I personally like the current load here, but bear in mind that Mileages May Vary and others doubtless think less is more. It takes all kinds to make a world, of course. [[Special:Contributions/141.101.98.206|141.101.98.206]] 17:06, 9 June 2021 (UTC)<br />
The theme of foreboding smart device here seems similar to how we don't really know what will happen next regarding AI. [[Special:Contributions/172.70.110.226|172.70.110.226]] 00:26, 10 June 2021 (UTC)<br />
<br />
<br />
I think the "one more thing" part of the title text may be a reference to Columbo, who would often lure a suspect into a false sense of security, before hitting them with a 'one more thing' where the hammer drops (in this tech case, that the bad thing is now about to be revealed). [[Special:Contributions/162.158.158.153|162.158.158.153]] 00:28, 10 June 2021 (UTC)<br />
<br />
Given Cueball had apparently been aiming to give a "threatening" presentation and suddenly had to change it to "non-threatening", I think it's possible he just changed a couple of words in his speech. The words "surprising and delighting" look a bit odd in the final frame. I suspect he simply replaced the word "annihilating" with "surprising and delighting", and "a few" with "a staggering number of". See how that reads to you. [[Special:Contributions/162.158.165.140|162.158.165.140]] 04:13, 10 June 2021 (UTC)<br />
<br />
Are we missing the difference between "unthreatening" and "non-threatening"? Unthreatening would describe the product in ways that are not threatening. Non-threatening would describe the product in terms of threats, but neither confirm nor deny whether the product would result in such threats. [[Special:Contributions/172.69.33.247|172.69.33.247]] 20:15, 19 June 2021 (UTC)</div>172.69.33.247