Life, 3

生命 3

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We exist in time because time is change.

Growing is part of the definition of life. Growing is a kind of change.

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Also, without time/change, there would be no thinking and no thoughts.

— Me@2017-12-26 11:42 am

— Me@2018-05-23 10:05:03 PM

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time ~ change

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Time is logically necessary if change is necessary.

— Me@2018-02-04 09:07:48 PM

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2018.05.23 Wednesday (c) All rights reserved by ACHK

The language of Change 1.2

Energy conservation, 6.2 | Energy 5.2

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time ~ change

energy ~ the ability of _keeping_ changing

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constant velocity ~ the amount of an object’s change of position, measured with respect to its observer’s unit of change, is constant

s = \Delta x

v = \frac{s}{\Delta t} = \frac{\Delta x}{\Delta t}

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kinetic energy ~ the amount of the ability of keeping changing an object’s position

\frac{1}{2} m v^2 ~ the square of (the amount of change of position, relative to the observer’s unit of change)

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Energy difference is _not_ exactly a measurement of the amount of change, time interval is.

— Me@2018-02-20 09:39:30 AM

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2018.02.20 Tuesday (c) All rights reserved by ACHK

The language of Change

Energy conservation, 6 | Energy 5

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time ~ change

energy ~ the ability of causing change

Assuming

1. a system of one single particle

2. has only kinetic energy

3. and that kinetic energy is conserved.

conservation of energy ~ an object’s potential amount of change of position, measured with respect to its observer’s unit of change, is constant

s = \Delta x

v = \frac{s}{\Delta t} = \frac{\Delta x}{\Delta t}

— Me@2018-02-15 02:21:20 PM

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Note:

The above argument has a bug:

If the mass m is constant, the kinetic energy E_K should be proportional to velocity squared v^2, instead of velocity v.

E_K = \frac{1}{2} m v^2

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However, the above argument is still technically correct:

When E_K is constant, v^2 is constant. In turn, the magnitude of v also remains unchanged.

— Me@2018-02-19 09:37:24 PM

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2018.02.15 Thursday (c) All rights reserved by ACHK

生命

玄悟慧能 1.3

這段改編自 2010 年 4 月 18 日的對話。

第二,從「審美標準」問題中,你會發現,有時,不應把說話講得太盡。

無論你說「審美是主觀的」,還是「審美是客觀的」,都會有明顯的漏洞,因為有明顯的反例。所以,正確的答案,很明顯是「審美既不絕對客觀,亦不完全主觀」。換而言之,穏陣(萬無一失)的答案是,兩者之間。

但是,你又不要以為,有了這個「正確」答案,問題就解決了,沒有神秘感,因為,你仍然未知道,是「兩者之間」的哪一處。

同理,我覺得「人生注定」的答案是,「介乎『完全注定』和『完全不注定』之間」。換句話說,任何一件事情,以至整體的人生,都由很多「自主」和「外在」的因素所形成的。而「自主」和「外在」這兩大因素中,各自又由一些「必然」,和一些「偶然」的小因素組合而成。

「生命」這個詞語很有意思。

「生」,就是指一些可改變的東西,例如,「生活」、「生氣」和「生機」等。「命」,就是指一些不可改變的東西,例如,「命運」、「命定」和「命令」等。

人生,就是由「生」(可改變的東西)和「命」(不可改變的東西)所組成。

— Me@2015.03.20

2015.03.20 Friday (c) All rights reserved by ACHK

Change

By the definition of “time”, anything in time must be changing. Anything not in time, such as the dead, cannot change.

If you do not keep changing for better (improve, grow), you are effectively dead.

— Me@2011.10.10

Although this paragraph is not 100% accurate, its spirit is useful.

— Me@2014.08.09

2014.08.09 Saturday (c) All rights reserved by ACHK

Energy

Energy is the ability of causing change.

Change is related to time.

That’s why energy is related to time.

— Me@2012-10-22 01:45:17 PM

Application of Noether’s theorem allows physicists to gain powerful insights into any general theory in physics, by just analyzing the various transformations that would make the form of the laws involved invariant. For example:

  • the invariance of physical systems with respect to spatial translation (in other words, that the laws of physics do not vary with locations in space) gives the law of conservation of linear momentum;
  • invariance with respect to time translation gives the well-known law of conservation of energy

— Wikipedia on Noether’s theorem

2014.03.25 Tuesday (c) All rights reserved by ACHK

變通

Easy 3

Easy” in Chinese is “容易”, literally meaning “able to change“.

— Me@2012-11-29 10:47:38 AM

It is not the strongest of the species that survives, nor the most intelligent, but rather the one most adaptable to change.

— Charles Darwin misquotation

The definition of insanity is doing the same thing over and over and expecting different results.

— Albert Einstein misquotation

If you are willing to change based on the feedback from the reality, many difficult things will become easy.

— Me@2012.12.17

易,窮則變,變則通,通則久。

— 系辭下

— 易經

2012.12.21 Friday (c) All rights reserved by ACHK

Rich Hickey, 2

Like Clojure, Datomic incorporates an explicit model of time. All data is associated with a time and new data does not replace old data, but is added to it. Returning to our previous example, if John later changes his address, a new datom would be added to the database, e.g.

  John, :street, “17 Maple St.”, T43

This mirrors the real world where the fact that John has moved does not erase the fact that John once lived on Swift St. This has multiple benefits: the ability to view the database at a point in time other than the present; no data is lost; the immutability of each datom allows for easy and pervasive caching.

— rjn945 15 days ago

— Hacker News

2012.03.21 Wednesday ACHK

Number, Time, Money, 2.7

Ideal clock 3.7 | 時間定義 13.7

第二,應用時間標籤時,我們並不會真的把它們逐對直接比較。

反而,我們是在各個事件發生時,先行從年曆、月曆、日曆 和 時鐘上,獲取時間讀數,然後把各個事件,放在時間軸上的對應位置。那樣,毋須做任何其他動作,所有你要考慮的事件,就會已經自動排列好。

— Me@2011.09.16

2011.09.16 Friday (c) All rights reserved by ACHK

Number, Time, Money, 2.6

Ideal clock 3.6 | 時間定義 13.6

(安:第二個大問題是,你剛才講過,沒有一套數字標籤系統(時間讀數)的話,有多於兩件事時,無論是

1. 要建構事件序列;

2. 要在原本的事件序列中,加插額外的另一件事;還是

3. 要把兩個事件序列,組合成一個序列,

都要將眾多對事件,逐對考慮發生的先後次序,十分麻煩。但是,有了一套數字標籤系統後,何嘗不是十分麻煩呢?

例如,我們原本的事件序列是「乙(-1)、甲(0)、丙(2)」。如果要額外加上第四件事「丁(1)」的話,你都要先比較(-1, 1)的大小關係、(0, 1)的大小關係 和 (2, 1)的大小關係,才可以知道「丁(1)」發生於「甲」「丙」之間,繼而更新序列為「乙(-1)、甲(0)、丁(1)、丙(2)」。

到頭來,也是要「逐對比較」。唯一的分別,就是原本是逐對事件比較先後,現在是逐對數字比較大小。)

第一,即使要「逐對比較」,「比較數字」遠比「比較事件」容易得多。我給任意的兩個數字你,你都會立刻知道,哪一個比較大。但是,某兩件事件的先後關係,有時十分明顯,有時不十分明顯,有時十分不明顯。

「十分明顯」的例子有:「甲 = 入大學;乙 = 大學畢業」。因為「入大學」是「大學畢業」的先決條件,所以「入大學」一定先於「大學畢業」發生。

「不十分明顯」的例子有:「甲 = 電燈面世;乙 = 電話面世」。

「十分不明顯」的例子有:「甲 = 地球形成;乙 = 火星形成」。

即使是「先後次序十分明顯的一堆事件」,「比較數字」仍然比「比較事件」容易得多。試想想,你怎樣「解釋」給電腦知,「入大學」是「大學畢業」的先決條件呢?

相反,如果「甲」和「乙」都有數字標籤的話,例如「甲 = 入大學(1999 年);乙 = 大學畢業(2002 年)」,毋須任何其他的解釋,電腦也會立刻知道,「甲」「乙」的先後次序。

即使有一百萬件事件要排序,如果當中的每一件事,都有時間標籤的話,電腦也可以輕易完成。相反,如果是一堆推理任務的話,一般的電腦不能勝任。

第二,應用時間標籤時,我們並不會真的把它們逐對直接比較。

— Me@2011.09.14

2011.09.14 Wednesday (c) All rights reserved by ACHK