# Blackboard 2

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.”

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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 $copyright CHK^2$