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TED2012

Terry Moore: Why is 'x' the unknown?

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Why is 'x' the symbol for an unknown? In this short and funny talk, Terry Moore gives the surprising answer.

- Thinker
Terry Moore is the director of the Radius Foundation, a forum for exploring and gaining insight from different worldviews. Full bio

I have the answer to a question that we've all asked.
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The question is,
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Why is it that the letter X
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represents the unknown?
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Now I know we learned that in math class,
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but now it's everywhere in the culture --
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The X prize, the X-Files,
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Project X, TEDx.
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Where'd that come from?
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About six years ago
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I decided that I would learn Arabic,
00:40
which turns out to be a supremely logical language.
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To write a word or a phrase
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or a sentence in Arabic
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is like crafting an equation,
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because every part is extremely precise
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and carries a lot of information.
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That's one of the reasons
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so much of what we've come to think of
00:59
as Western science and mathematics and engineering
01:01
was really worked out in the first few centuries of the Common Era
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by the Persians and the Arabs and the Turks.
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This includes the little system in Arabic
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called al-jebra.
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And al-jebr roughly translates to
01:15
"the system for reconciling disparate parts."
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Al-jebr finally came into English as algebra.
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One example among many.
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The Arabic texts containing this mathematical wisdom
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finally made their way to Europe --
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which is to say Spain --
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in the 11th and 12th centuries.
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And when they arrived
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there was tremendous interest
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in translating this wisdom
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into a European language.
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But there were problems.
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One problem
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is there are some sounds in Arabic
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that just don't make it through a European voice box
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without lots of practice.
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Trust me on that one.
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Also, those very sounds
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tend not to be represented
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by the characters that are available in European languages.
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Here's one of the culprits.
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This is the letter SHeen,
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and it makes the sound we think of as SH -- "sh."
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It's also the very first letter
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of the word shalan,
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which means "something"
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just like the the English word "something" --
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some undefined, unknown thing.
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Now in Arabic,
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we can make this definite
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by adding the definite article "al."
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So this is al-shalan --
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the unknown thing.
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And this is a word that appears throughout early mathematics,
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such as this 10th century derivation of proofs.
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The problem for the Medieval Spanish scholars
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who were tasked with translating this material
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is that the letter SHeen and the word shalan
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can't be rendered into Spanish
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because Spanish doesn't have that SH,
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that "sh" sound.
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So by convention,
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they created a rule in which
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they borrowed the CK sound, "ck" sound,
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from the classical Greek
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in the form of the letter Kai.
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Later when this material was translated
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into a common European language,
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which is to say Latin,
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they simply replaced the Greek Kai
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with the Latin X.
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And once that happened,
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once this material was in Latin,
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it formed the basis for mathematics textbooks
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for almost 600 years.
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But now we have the answer to our question.
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Why is it that X is the unknown?
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X is the unknown
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because you can't say "sh" in Spanish.
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(Laughter)
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And I thought that was worth sharing.
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(Applause)
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Translated by Timothy Covell
Reviewed by Jenny Zurawell

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About the Speaker:

Terry Moore - Thinker
Terry Moore is the director of the Radius Foundation, a forum for exploring and gaining insight from different worldviews.

Why you should listen

Terry Moore directs the Radius Foundation in New York, which, as its website says, "seeks new ways of exploring and understanding dissimilar conceptual systems or paradigms -- scientific, religious, philosophical, and aesthetic -- with the aim to find a world view of more complete insight and innovation. The Radius Foundation is a forum for different views."

The foundation has published several works that examine the intersection of religion and metaphysics with science and social action.

More profile about the speaker
Terry Moore | Speaker | TED.com