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Revision as of 03:05, 4 September 2013

Welcome to the explain xkcd wiki!

We have an explanation for all 1576 xkcd comics, and only 0 (0%) are incomplete. Help us finish them!

Latest comic

Go to this comic explanation

Engineer Syllogism
The less common, even worse outcome: "3: [everyone in the financial system] WOW, where did all my money just go?"
Title text: The less common, even worse outcome: "3: [everyone in the financial system] WOW, where did all my money just go?"

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: It can be improved.

A syllogism is a logical argument where two or more propositions lead to a conclusion through deductive reasoning. For example, one of the best-known syllogisms is:

  1. All men are mortal
  2. Socrates is a man
  3. Therefore, Socrates is mortal

In this comic, Cueball is an engineer who is attempting to make the following syllogism:

  1. I am good at understanding "numbers" (i.e., mathematics)
  2. The stock market is made of numbers
  3. Therefore, I am good at understanding the stock market

Since most engineers are good at math, proposition 1 seems to be true. It is also loosely true that the stock market is made of numbers, but only in the sense that every system can be given a post-hoc numeric characterization; the dynamics of the stock market are primarily human-driven. In this comic Cueball thinks that his skill at math will help him beat the stock market. Little does he know that the system can be unpredictable, so he ends up losing money as the stock he's invested in crashes. This outcome is foreshadowed in the title text of 592: Drama.

Even if the propositions "I am good at understanding numbers" and "The stock market is made of numbers" were true in Cueball's interpretation, and even if the implicit premise that understanding a system's components implies understanding the system held, Cueball would still be wrong to conclude that "I am good at understanding the stock market": this would be a fallacy of the undistributed middle. The problem is that proposition 1 seems to say "I am good at understanding all math". However, the "all" is not present, so Cueball may not necessarily understand the math underlying the stock market.

The title text could be a reference to the recent 2015 Chinese stock market crash or to economic depressions in general.

Transcript

[An white frame with text inside two lying down "{" type parenthesis]
An engineer
syllogism.
[Cueball is at his desk in front of his computer, with his hands on his knees, thinking.]
Cueball, thinking: 1: I am good at understanding numbers.
[Cueball takes one hand to his chin, still thinking.]
Cueball, thinking: 2: The stock market is made of numbers.
[Cueball lifts both arms from his legs, still thinking.]
Cueball, thinking: 3: Therefore I-- Wow, where did all my money just go?


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Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • List of all comics contains a table of most recent xkcd comics and links to the rest, and the corresponding explanations. There are incomplete explanations listed here. Feel free to help out by expanding them!
  • If you see that a new comic hasn't been explained yet, you can create it: Here's how.
  • We sell advertising space to pay for our server costs. To learn more, go here.

Rules

Don't be a jerk. There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to —and helping everyone better understand— xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

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