Lost in Translation

Suddenly I realize I am old.

Hearing somebody asking questions I asked in the mellow college year which is far far away.
Answering everything in such a cliche used to belong to my father and mother.
Trying to remember the last golden autumn in a cold early winter morning.
Feeling so upset as seeing young lovers laughing while passing by.

So suddenly you notice you are aging, as all the clouds, stars and dreams rushing through the sky.

And that is life, and that is life.

But administration becomes harder. Tell me if you have a satisfactory solution.

从非相对论量子力学到相对论量子场论。

motivation:
QFT内含的对称性使得公式表述异常简单，却因存在太多的纵横联系使最简明的物理思想掩盖在华丽外壳之下。既然量子力学作为QFT的极限，后者最简明的思想应该多半显示出来，事实正是如此。

Example:
1。量子力学隐含了镜像反演平方为正负1的事实，并在自由度高于2维将符号赋予玻色，费米（子）
2。非相对论玻色弦振动要求负能量激发态的反粒子解释，并在此解释下自洽。
3。非相对论费米弦振动负能量激发态不仅要求反粒子解释，还要求处理正负频对应，否则中性粒子的实条件不能满足。

homework:
将以上内容推广到高维和相对论情形，注意对称性衍生出的表述简洁，因果律在对称性联系下自然满足。
这揭示了一个事实：离散对称，初条件+连续对称=物理。

bonus:
旋量也许是低维几何最深刻的基础

Some peculiar situation may repeat again and again.

It was 5:30 pm, everybody around me started checking time every few minutes, and watched the same direction, then I knew the 5:20 routine van will never come again.

It is not the first time, and definitely not the last. Almost the same day two years ago, we stood at the same stop, waiting for the non-exist 5:20 bus. It is ironic that you can trust everything and believe all dreams until it goes wrong once, then you just need to get used to the reality and wait for its breaking again.

So food CAN kill people, money DOES matter, hurricane MAY happen. We are growing up by learning. So politicians DO lie, parents ARE cheating each other. And the most important, I AM nobody.

Hongyu found four huge fungus outside Bloomberg last weekend. The largest one was destoryed by the discoverer, who thought it eatable like ordinary mushroom.

Well, according to online reference, it IS eatable, and is also an valuable medicine. By tradition back in my country, everyone find a “MABO” can become famous by reporting it. So we report THEM here. Just for fun.

Discoverd by Hongyu Guo
Photo by J. Li

I lost 10 page calculation sheets, which have not been type in since last week was a unbelievable busy one.
Redo is not only a matter of time. I felt so angry as rebuild procedure going. How can anyone stand for this kind of job, being forced to repeat everything again and again.
The end of this story is, after I wrote 5 pages already, the original one appeared in the bottom of the bookshelf.

Our department has a old style postage machine, whose printer and meter are connected by cables. Having a package to mail, this afternoon I spent hours trying to make it work.
However, the only message appeared on the screen is ‘’meter check date error'’, although I can choose mail class and even calculated the correct postage.

Anyone can help me?