# Physics PageRank

PageRank 7

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Physics has a high PageRank among fields of knowledge.

— Me@2011.07.28

— Me@2011.08.12

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# Ideal clock 1.3

An ideal clock is a clock (i.e., recurrent process) that makes the most other recurrent processes periodic.

— Wikipedia on Clock

The ideal clock itself is a meta-clock — a property of a set of clocks.

— Me@2015-04-16 9:35 AM

If you compare the accuracies of two clocks (A and B) by comparing each of them with a third clock (C), then I can ask, “How can you know that C is more accurate than both A and B?”

By defining the ideal clock as a meta-clock, we avoid infinite regress.

— Me@2015-04-27 11:36:59 AM

# Ideal clock 1.2

A clock is a recurrent process and a counter.

A good clock is one which, when used to measure other recurrent processes, finds many of them to be periodic.

An ideal clock is a clock (i.e., recurrent process) that makes the most other recurrent processes periodic.

— Wikipedia on Clock

The ideal clock itself is a meta-clock — a property of a set of clocks.

— Me@2015-04-16 9:35 AM

# Confirmation

Ideal clock 4 | 物理定律團 1.1.2 | Verification principle, 6

confirm = is compatible with

A confirms B

= A is compatible with B

The assumptions that are compatible with most other physical laws and events are called physical laws. In this sense, physical laws are conventions.

conventions ~ convenience

The physical laws are the most convenient assumptions to describe the physical world.

most convenient ~ most cost-effective

— Me@2013.10.25 19.32.56

Copy Me, 5.4

— Me@2012.10.08

# Number, Time, Money, 2

Ideal clock 3 | 時間定義 13

「理想時鐘」的恰當定義是，讀數和最多其他時鐘吻合的鐘。「快慢」可以相對於「理想時鐘」的讀數來描述。

（安：但是，這到頭來也要用「時間」這個概念來定義「快慢」。

（安：但是，我又可以追問，你的「理想時鐘」究竟在量度什麼？）

— Me@2011.09.07

# Time PageRank

PageRank 6 | Ideal clock 2.2 | 時間定義 12.2

（安：如果不容許提及「時間」這個概念呢？那如何描述「快慢」？）

「快慢」可以相對於「理想時鐘」的讀數來描述。你問這個問題，其實就相當於問，何謂「理想時鐘」？

— Me@2011.09.03

# PageRank 5

Socializing = PageRank-ing

— Me@2011.09.01

# Indexing 3

Google 並不是在你打了一組 keywords（關鍵字）後，才尋找相關的網站，然後計算每個網站的「PageRank 得分」；而是在事前就整理好「哪些網站和哪些 keywords 相關」 和 計算定每個網站的「PageRank 得分」。

— Me@2010.09.14

# Indexing 2

（安：那我在 search engine（搜尋器）打了一組 keywords（關鍵字）後，search engine 中途會做些什麼，然後給予我想要的 search results（搜尋結果）呢？）

（安：那即是話，我在 search engine 打了一組 keywords 後，search engine 會立刻尋找相關的網站，然後計算每個網站的「PageRank 得分」，從而把它們排序？）

（安：什麼意思？）

Google 並不是在你打了一組 keywords 後，才尋找相關的網站，然後計算每個網站的「PageRank 得分」；而是在事前就整理好「哪些網站和哪些 keywords 相關」 和 計算定每個網站的「PageRank 得分」。

— Me@2010.09.11

# Indexing

（安：search engine（搜尋器）的原理是什麼？它以什麼方法，在極短時間內，得在那些 search results（搜尋結果）？）

（安：前者。）

— Me@2010.09.09

# Ideal clocks

* A clock is a recurrent process and a counter.
* A good clock is one which, when used to measure other recurrent processes, finds many of them to be periodic.
* An ideal clock is a clock (i.e., recurrent process) that makes the most other recurrent processes periodic.

— Wikipedia on Clock

2010.06.01 Tuesday ACHK

# PageRank

The name “PageRank” is a trademark of Google, and the PageRank process has been patented (U.S. Patent 6,285,999). However, the patent is assigned to Stanford University and not to Google. Google has exclusive license rights on the patent from Stanford University. The university received 1.8 million shares of Google in exchange for use of the patent; the shares were sold in 2005 for \$336 million.

— Wikipedia on PageRank

2010.02.15 Monday ACHK