6.3.1 Feynman’s Blackboard

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Physics

= Relativity + Quantum Mechanics

= 相對論加量子力學

= 深深深

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6.3.2 Quantum Mechanics | 量子力學

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When physicist Feynman was a student,

there were two versions of Quantum Mechanics.

They described the same thing

but in different mathematical languages.

One version was Heisenberg’s Matrix Mechanics (矩陣力學) , using matrices. Another was Schrodinger’s Wave Mechanics (波動力學), using differential equations.

Feynman could understand **neither** of them.

So he spent 8 years to **create**

his **own** version of quantum mechancis

in order to **understand** quantum mechanics [1].

Feynman’s version of quantum mechanics is now called

Feynman path-intergral. (路徑積分)

After Feynman’s death, [2] people found that Feynman had written some words on the left-hand top corner of his blackboard:

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“What I cannot **create**, I do not understand.”

不是由我自己想出來的東西, 我都不能理解.

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[1] Dyson, *Disturbing the Universe* (1979)

[2] “I’d hate to die twice. It’s so boring.” — Feynman’s last words

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2008.10.07 Tuesday