Daily Archives: April 24, 2018

Quantum decoherence 8

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12. On the other hand, consistent histories are just a particular convenient framework to formulate physical questions in a certain way; the only completely invariant consequence of this formalism is the Copenhagen school’s postulate that physics can only calculate the probabilities, they follow the laws of quantum mechanics, and when decoherence is taken into account, to find both the quantum/classical boundary as well as the embedding of the classical limit within the full quantum theory, some questions about quantum systems follow the laws of classical probability theory (and may be legitimately asked) while others don’t (and can’t be asked)[.]

— Decoherence is a settled subject

— Lubos Motl

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2018.04.24 Tuesday ACHK

Intuition

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Unsourced variant:

The intellect has little to do on the road to discovery. There comes a leap in consciousness, call it intuition or what you will, and the solution comes to you and you do not know how or why. All great discoveries are made in this way.

The earliest published version of this variant appears to be The Human Side of Scientists by Ralph Edward Oesper (1975), p. 58, but no source is provided, and the similarity to the “Life Magazine” quote above suggests it’s likely a misquote.

In response to statement “You once told me that progress is made only by intuition, and not by the accumulation of knowledge.”

It’s not as simple as that. Knowledge is necessary, too. An intuitive child couldn’t accomplish anything without some knowledge.

There will come a point in everyone’s life, however, where only intuition can make the leap ahead, without ever knowing precisely how. One can never know why, but one must accept intuition as a fact.

— Albert Einstein

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2018.04.24 Tuesday ACHK

Inception 16.4.2

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潛行凶間 16.4.2

這段改編自 2010 年 8 月 13 日的對話。

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例如，你在夢裡，正在期待著夢中故事的結局時，就不小心地醒了。你試過沒有？

（CPK：試過臨知道答案前，就醒了。）

你留意，《潛行凶間》就刻意拍到那樣—在觀眾就要知道結果時，就停了。換句話說，導演 Christopher Nolan 刻意把這部以夢為主題的電影，拍到有如夢境一樣。

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那是他的習慣。例如，他的另一部電影—《死亡魔法》—以魔術為主題。導演就把它拍到彷彿魔術一般，由始至終，一路戲弄著觀眾。

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所以，千萬不要連續看幾部，Christopher Nolan 的電影。看了一部已後，最好先隔一段時間，待心情平伏以後，才看下一部。

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至於《潛行凶間》結尾，主角是否還在夢境之中？

是或否，兩個解釋，二選其一，都可以講得通。

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你記不記得，戲中有一句，大概有以下的意思：「在夢中，通常都不會知道，自己正在發夢。只會在蘇醒時，才發現剛才，自己在發夢；才驚覺剛才，劇情不合理。」

你在看《潛行凶間》時，都有同樣的感覺。在戲院看時，覺得一切都合理，又有詳細解釋。但是，看完後，回家時，才驚覺劇情，有些地方不妥，講來講去講不通。其中一個例子是，陀螺會不會停止，並不能用來推斷，主角是否仍在夢中。

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如果陀螺永不停止，那必定是夢中。但是，如果陀螺倒了下來，也不一定是現實，因為，即使在夢中，造夢者都可以令陀螺停止。

— Me@2018-04-24 11:36:31 AM

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Some pundits have argued that the top was not in fact Cobb’s totem, rendering the discussion irrelevant. They say that the top was Mal’s totem; Cobb’s was his wedding ring, as he can be seen wearing it whenever he is in a dream and without it whenever he isn’t. As he hands his passport to the immigration officer, his hand is shown with no ring; thus he was conclusively in reality when seeing his children. Furthermore, the children were portrayed by different actors, indicating they had aged.

— Wikipedia on Inception

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2018.04.24 Tuesday (c) All rights reserved by ACHK