I sometimes want to be a teacher but think my teaching role can best be by my example—not by class or going to find students.
— Lessons from the Light
— Kenneth Ring
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2008.04.12 Saturday
Author Archives: rpflee
3.5.8 preserve time
You can’t preserve time by not using it. When time is not used, time would still pass.
You can preserve time only by using it, spending it, investing it, transforming it into something much more valuable.
If you know how to preserve time, you do not fear the passage of time. Instead, you love the passage. As time goes, more good works are getting done.
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2008.04.10 Thursday
當下即是
If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those live in present.
— Wittgenstein
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This quotation induces me to have the following thought:
If you concentrate on a meaningful work now and here, you preserve your infinity. (No explanation here.)
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2008.04.09 Wednesday
3.5.7 palm
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To see a world in a grain of sand
And a heaven in a wild
Hold infinity in a palm of your hand
And eternity in an hour
— William Blake
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無人能夠奪去屬於我的一秒鐘.
我永遠存活在那一秒鐘 –
過去, 現在, 未來, 盡收其中.
— Mr. Lee’s 網上思考
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一沙一世界
一花一天堂
掌中握無限
刹那即永恆
— 佛家
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2008.04.07 Monday
3.5.6 have no regrets
… had induced me sometimes to say that if it were left to my choice I should have no objection to go over the same life from its beginning to the end.
— Benjamin Franklin
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2008.04.06 Sunday
Nobel Prize x 2, part 1
The Nobel Prize in Physics in 1956
Bardeen brought only one of his three children to the Nobel Prize ceremony. His two sons were studying at Harvard University, and Bardeen didn’t wanted to disrupt their studies. King Gustav scolded Bardeen because of this, and Bardeen assured the King that the next time he would bring all his children to the ceremony.
The Nobel Prize in Physics in 1972
In 1972, John Bardeen shared the Nobel Prize in Physics with Leon Neil Cooper of Brown University and John Robert Schrieffer of the University of Pennsylvania for their jointly developed theory of superconductivity, usually called the BCS-theory.
Bardeen did bring all his children to the Nobel Prize ceremony in Stockholm, Sweden.
— Wikipedia
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Excellence is an art won by training and habituation. We do not act rightly because we have virtue or excellence, but we rather have those because we have acted rightly. We are what we repeatedly do. Excellence, then, is not an act but a habit.
— Aristotle
— Me@2022.09.12 01:07:54 PM
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2008.04.06 Sunday
Octupole Expansion
I have used a whole month to do this derivation.
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![\displaystyle{Q_{ijk} = \int_{\mathbf r} \left[ \delta_{ij} ( r^2 - 5 r_i r_j + \frac{10}{3} r_i r_j \delta_{jk} ) r_k - |\epsilon_{ijk}| 10 r_i r_j r_k \right] \rho(\mathbf r) d^3 r}](https://s0.wp.com/latex.php?latex=%5Cdisplaystyle%7BQ_%7Bijk%7D+%3D+%5Cint_%7B%5Cmathbf+r%7D+%5Cleft%5B+%5Cdelta_%7Bij%7D+%28+r%5E2+-+5+r_i+r_j+%2B+%5Cfrac%7B10%7D%7B3%7D+r_i+r_j+%5Cdelta_%7Bjk%7D+%29+r_k+-+%7C%5Cepsilon_%7Bijk%7D%7C+10+r_i+r_j+r_k+%5Cright%5D+%5Crho%28%5Cmathbf+r%29+d%5E3+r%7D&bg=ffffff&fg=333333&s=1&c=20201002)
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But I still do not know whether it is correct or not.
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2008.04.06 Sunday
Job: Pragmatic Idealism
The ideal situation occurs when the things that we regard as beautiful are also regarded by other people as useful.
— Donald Knuth
2008.04.02 Wednesday
3.5.5 regrets
Sometimes, you have done something you regret. You want to go to the past to undo what you have done. You cannot do so as you are already your-now-self. You cannot become your-past-self anymore. You cannot send a message to your-past-self.
Sometime in the future, your-future-self would have done something he regrets. He wants to go to his past to undo what he has done. He cannot do so as he is already his-now-self. He cannot become his-past-self anymore.
However, YOU can help him. His past-self is YOU. His past-self is your now-self. You can know what he has done wrong by receiving messages from him.
Live as if you were living for the second time and had acted as wrongly the first time as you are about to act now.
— Victor E. Frankl
2008.03.30 Sunday
3.5.4 send messages to your future-self
Sending messages to your future-self is much easier.
Writing.
If you want to send a message to your ten-year-later-self, write it down. Put the message in a drawer. Do not read it until ten years later.
This is the meaning of writing.
2008.03.28 Friday
3.5.3 deja vu 似曾相識
Extend yourself
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To meet your past and future self now, just extend you to other people, e.g. your brother, your grandpa …
The method is to extend yourself beyond your personal-self. When you see your younger brother, you may regard him as your past-self. When you see an old person, you may regard him as your future-self.
Learning from other people’s experience can emulate the effect of receiving messages from your future-self.
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2008.03.27 Thursday
Job: Meaning of Life
All life is problem solving.
— Karl Popper
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2008.03.26 Wednesday
Job: Security
Our only real economic security lies in our power to meet human needs.
So the worse conditions become, the more evident human needs become.
Our security does not lie in our organizations or our jobs; disruptive technologies may simply make them irrelevant.
— The 8th Habit
— Stephen Covey
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2008.03.25 Tuesday
Lectures 4
To learn to think, you need two things: large blocks of time, and as much one-on-one interaction as you can get with someone who thinks more clearly than you do.
— Stephen C. Stearns, Ph.D.
2008.03.25 Tuesday
Postman
3.5 Time messenger
A time messenger is someone who can send and receive letters to and from the past and to and from the future.
You are a time messenger.
3.5.1 send messages to your past self
You cannot send messages into the past. Even if you can, you cannot receive it, for you have already become your now-self. Only your past-self can receive the message, your now-self cannot.
3.5.2 receive messages from your future self 接收來自未來的訊息
You can receive the message sent by your future self because you are your now-self now.
What if your future self did not send the message you want to receive?
That is nonsense. You are always creating your own future-self. Your future-self is under your control.
How to receive messages from your-future-self?
Vision: 先知先覺 洞悉先機
To receive messages from your future-self, you need vision.
Vision is a function of common sense. Common sense is a function of vast knowledge and creativity.
How to get such knowledge and creativity?
1. Read
2. Observe
3. Experience
4. Create
Then imagine yourself as your ten-year-later self. If you are yourself-in-ten-year-later, what would you want to tell your now-self?
2008.03.20 Thursday
Clarke’s three laws
1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
3. Any sufficiently advanced technology is indistinguishable from magic.
— Arthur C. Clarke
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2008.03.17 Monday
See
I’ve found that people who are great at something are not so much convinced of their own greatness as mystified at why everyone else seems so incompetent.
— Paul Graham
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2008.03.13 Thursday
3.4 Passage
3.4 Living in now-here, eliminate the passage of time
If you have always unleashed all the potential of time, you will not fear the passage of time. Since rather than being gone, time is transformed to something more valuable.
Just like when you have bought something that deserves much more than its cost, you would not feel that you have lost the money.
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2008.03.11 Tuesday
Nowhere
3.3 You are nowhere but nowhere
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People always have an escape-character.
We often think that the past is better than now (good-old-days thinking); or the future will be better than now (procrastination).
Thinking in either way is not useful, for you are always here, you are always in now.
You are in nowhere but now-here.
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2008.03.10 Monday
Road Not Taken
Two roads diverged in a wood, and I—
I took the one less traveled by,
And that has made all the difference.
— Robert Frost
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Explanation and interpretations
The poem, especially its last lines, where the narrator declares that taking the road “one less traveled by” “made all the difference,” can be seen as a declaration of the importance of independence and personal freedom. However, Frost likely intended the poem as a gentle jab at his great friend and fellow poet Edward Thomas, and seemed amused at this slightly “mischievous” misinterpretation. The Road Not Taken seems to illustrate that once one takes a certain road, there’s no turning back, although one might change paths later on, they still can’t change the past.
— Wikipedia
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2008.03.05 Wednesday
Physics Town 
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