explain xkcd: It's 'cause you're dumb.
Another one of the math-love relationship comics, a mathematical depiction of pain as a derivative of time is shown. It is hoped that dPain/dt, or the change in rate of pain (in this case, shrinking), decreases quickly so that the pain will vanish quickly.
If k1 was positive or if k2 was a large value, the value of dPain/dt would approach zero. Ideally, k1 would be "How much she's in my live"/Pain (which, if we assume both these values are positive, would mean the ideal k1 would be positive), while k2 would ideally be extremely large. Either of these scenarios approach what would be a situation where the value of dPain/dt is close to zero.
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- dPain/dt = (-k_1 Pain + [Image of girl]) (1/(1 + e ^ -(t-k_2)/d))
- [Image of girl]=How much she's still in my life
- Please let d only be a few days... or weeks
- I guess there's some kind of a cutoff after years, where it stops mattering and we can be friends. Do I _want_ that?
- Is k_1 positive? Is k_2 large?
- Will I ever stop feeling like this?
== Explanation ==
- Since this is my first real contribution here I'm putting everything on the talk page instead of on the article itself.
The equation describes Pain as a function of Pain, time, and several constants. This is a first-order linear differential equation with possible solution:
Pain = c_1 (e^k_2 + d e^t)^(-k_1) + (Girl)/k_1
Hopefully, d is relatively small ("days... or weeks"), thereby diminishing the time it takes for Pain to change. Significantly, k_1 needs to be positive, otherwise the first term would grow unbounded and Pain would never decrease. Assuming k_1 is positive, a larger k_2 results in a lower initial state. Again assuming k_1 is positive, the "Girl" term guarantees there will always be a nonzero amount of Pain since Pain approaches Girl/k_1 asymptotically, unless of course "How much she's still in my life" is zero. This probably gives rise to observation "I guess there's some kind of a cutoff after years."
--Smartin (talk) 02:33, 1 January 2013 (UTC)
Applying dimensional analysis suggests the 'How much she's still in my life' has the same units as 'Pain'. This makes no sense.
In addition, the explanation that pain will eventally reach zero after 'how much she's still in my life' reaches zero (either through drifiting apart or death?) 'after a number of years' is contradicted by the text of the comic (...we can be friends). Perhaps the formulation is incorrect?
I would like to suggest that the first term be corrected to : (-k1.pain.(1-megan)) where 'megan' lies between 0 and 1. This makes dimensional sense.
I would also like to suggest that the denominator of the second term be amended to: (1+ e^((K2-t)/d))). By my reckoning this allows a time period approximately equal to K2 where dPain/dt is small, so providing the cut-off period. After this period, dPain / dt gets increasingly negative.
My own experience is that K2, in my terms, is proportionate to the amount of denial you indulge in and inversely proportionate to the presence of someone else to help you pull through! Whatever, the cartoon provided a good amount of laughter which also helps.
) 19:36, 20 May 2013 (UTC) HandyAndy 20:35 BST, 2013-05-20 (ref ISO 1806 ;-))