385: How it Works
(the subheading helps the overview.) |
(→The math) |
||
| Line 11: | Line 11: | ||
===The math=== | ===The math=== | ||
| − | The mathematics displayed is neither {{w|semantically}} nor {{w|syntactically}} correct. To begin with, there should be a ''dx'' after x<sup>2</sup>. (That's easy enough to forget.) Now we have an {{w|indefinite integral}} on the left hand side. | + | The mathematics displayed is neither {{w|semantically}} nor {{w|syntactically}} correct. To begin with, there should be a ''dx'' after x<sup>2</sup>. (That's easy enough to forget.) Now we have an {{w|indefinite integral}} on the left hand side. There is still something missing from the equation, however. |
| + | It could be possible that {{w|π}} is just wrong: What we want is a {{w|Function (mathematics)|function}}, whose {{w|derivative}} is x<sup>2</sup>. Now, x<sup>3</sup>/3 satisfies this condition. However, since adding a {{w|constant (mathematics)|constant}} to a function does not change its derivative, the full answer is (any function on the form) x<sup>3</sup>/3 {{w|Constant of integration|+ C}}, where C is any fixed number. The "plus a constant"-part is very easy to forget, and might even be omitted by a (sloppy) professional mathematician. So if someone really gave the answer π, "you forgot to add a constant" would be a pretty funny remark, cause in one way it's true, but on the other hand it wouldn't quite be the main thing to worry about. | ||
| + | Another possibility is that more was forgotten on the left side of the equation -- bounds of integration. If there were a 0 below the integral and a cube root of 3π above the integral symbol, the answer π would be correct. In this case, however, pi+C would be incorrect. | ||
Congratulations, now you can also get [http://www.netfunny.com/rhf/jokes/old90/constant.html this classical joke]! | Congratulations, now you can also get [http://www.netfunny.com/rhf/jokes/old90/constant.html this classical joke]! | ||
Revision as of 22:08, 11 March 2013
| How It Works |
 Title text: It's pi plus C, of course. |
Explanation
The comic reveals discriminative jargon against women when doing a task. When a guy does something wrong, it's his own mistake. When a girl does something wrong, it is taken as a confirmation that girls are inferior.
The math
The mathematics displayed is neither semantically nor syntactically correct. To begin with, there should be a dx after x2. (That's easy enough to forget.) Now we have an indefinite integral on the left hand side. There is still something missing from the equation, however. It could be possible that π is just wrong: What we want is a function, whose derivative is x2. Now, x3/3 satisfies this condition. However, since adding a constant to a function does not change its derivative, the full answer is (any function on the form) x3/3 + C, where C is any fixed number. The "plus a constant"-part is very easy to forget, and might even be omitted by a (sloppy) professional mathematician. So if someone really gave the answer π, "you forgot to add a constant" would be a pretty funny remark, cause in one way it's true, but on the other hand it wouldn't quite be the main thing to worry about. Another possibility is that more was forgotten on the left side of the equation -- bounds of integration. If there were a 0 below the integral and a cube root of 3π above the integral symbol, the answer π would be correct. In this case, however, pi+C would be incorrect.
Congratulations, now you can also get this classical joke!
Transcript
- [Cueball and an friend stand at a blackboard. The friend is writing, in standard mathematical notation, that the integral of x squared equals pi. No differential or bounds are given for the integral.]
- Cueball: Wow, you suck at math.
- [The same scene, except the writer is Megan.]
- Cueball: Wow, girls suck at math.
add a comment!