Reading as a god

Chapter 115 Ship New Mask
Zhang Shan gave up her wild thinking.

Circle all the pieces of information listed related to discrete mathematics with a pen.

Zhang Shan was surprised to find that among this type of fragments, fragments No. 102, 103 and 104 were all related to the four-color problem.

The reason why Zhang Shan was surprised was because Zhang Shan remembered that this problem had been solved long ago.

The four-color theorem, also known as the four-color conjecture, is a famous typical example in discrete mathematics, which is one of the three major modern mathematical problems in the world.

It was proposed by a British cartographer, Francis Guthrie, in 1852. When he was coloring maps, he discovered a phenomenon, "Each map can be colored with only four colors, and the common Countries on the border can be colored differently."

Although this problem has troubled people for a very long time, in 1976, Kenneth Appel and Wolfgang Haken used computer-aided calculations, using 1200 hours and 100 The four-color theorem is still proved after a billion judgments.

However, it may be because the proof process of these two people is obviously more complicated, and there are still many people who simplify the proof of this problem afterwards.

In 1994, Simuel and others revised the proof method, and in 2005, Guntier proved it in a new form.

Each generation of proofs has its own characteristics and shortcomings.

According to the current situation, Zhang Shan estimates that most of what he writes can only be a paper on the four SCI regions.

After all, there are too many supplementary studies on the four-color problem.

But who knows, maybe the fragments related to the four-color problem provided by the system may be able to provide a more perfect proof.

Or the system will bring some new ideas in the expansion of the four-color theory!
Zhang Shan wrote and drew on paper, sorted out the basic knowledge points behind the relevant fragments, and spent another hour in the reference room without knowing it, accumulating 8100 experience points (including 50 %).

"The current system level is level 9, and the experience required to upgrade is 20/573"

I have generally known which fragments are valuable fragments, but the corresponding bibliography Zhang Shan can only choose to go to the Jiezi Space Library to use the Youxiang Reading Card to read. What is the specific form.

But no matter what form it is, the foundation must always be laid from a little bit.

There is no reason why a person who can publish SCI in mathematics cannot do calculus and linear algebra.There is no reason why a person who can write in English cannot be good at English.

The material conditions are already sufficient, and of course the spiritual world must also be rich.

The more he learned, the less he knew, so Zhang Shan decisively decided to go back and replenish various related knowledge.

~~~
Luo Changhui worked overtime last night and didn't close her eyes all night.

Even so, she rushed to Zhang Shan's residence in a hurry when she heard Zhang Shan's anxious tone urging that there was something urgent.

Zhang Shan is really a good boss who is good at observing, and he can see Luo Changhui's mental state is not good at a glance.

Zhang Shan believes that Luo Changhui’s state is strictly anxiety, that is, Anxiety, which refers to an unpleasant complex emotional state such as tension, restlessness, worry, and annoyance caused by an individual’s imminent and possible danger or threat.

Knowing that Luo Changhui didn't even do the most basic morning jog in the morning, Zhang Shan decisively pulled Luo Changhui to do some exercise!

It makes sense for Zhang Shan to do so, because neuroscience research shows that exercise can stimulate the secretion of a chemical substance in the brain-endorphins, which can make people's body and mind in a relaxed and happy state.

Endorphins, also known as endorphins, are morphine-like hormones secreted by the brain.

The reason why it is called "endorphine" refers to the morphine-like substances produced in the body. It can produce the same pain-relieving and euphoric effects as morphine, which is equivalent to a natural analgesic.In terms of function, endorphins can not only relieve pain, but also adjust negative emotions, make people happy physically and mentally, resist sadness; improve insomnia; mobilize the neuroendocrine system, improve immunity; boost the spirit, stimulate creativity and improve work efficiency.

Facts have proved that Zhang Shan's stimulation plan is very effective. During the exercise, not only a large amount of endorphins are secreted.

And a lot of dopamine~
Dopamine (DA, or 3-hydroxytyramine, 3-dihydroxyphenylethylamine) is an endogenous nitrogen-containing organic compound, which is tyrosine (aromatic amino acid) in the metabolic process through dihydroxyphenylalanine produced intermediate products.

In layman's terms dopamine is a neurotransmitter, a chemical used to help cells transmit impulses.

This brain secretion is related to human lust and feeling, and it conveys the information of excitement and happiness.

In other words, Luo Changhui should undoubtedly be very happy now and~~
As for why there are some strange secretions of steroid hormones during exercise, Zhang Shan thinks this is a completely normal phenomenon, and it will be secreted normally even if you don't do any exercise.

Zhang Shan saw Luo Changhui rushing over without makeup, after about an hour of exercising.

Zhang Shan also helped her touch up her makeup, Zhang Shan couldn't cope with the delicate makeup, so she hastily applied a mask for her~
However, although it is just a mask, there are many ways behind it.

The mask covers the stratum corneum of the skin, provides moisture to the stratum corneum, and fully hydrates the stratum corneum to improve the appearance and elasticity of the skin; it contains moisturizing agents and softeners, etc., and has a sealing effect, which can reduce the loss of water from the skin and make the stratum corneum soft , to promote the absorption of active ingredients through the skin.

This kind of mask is different from the ordinary ones on the market that are advertised as biological masks. Zhang Shan told Luo Changhui that this mask is really 100% active.

Unlike the constant temperature of 40°C where the steam mask works, the mask used by Zhang Shan is really close to the body temperature.

At the same time, it is different from the heating principle of the steam mask (after unpacking the sealed package, the air will pass through the controlled-release layer and slowly release to the middle active layer. After the heating matrix encounters the air, it will start to react with heat energy and reach it in about 1 minute), Zhang Shan said. The initial "heat mode" of the mask used is more in line with bioengineering.

And it contains collagen, which is very helpful for caring for the skin.

Unlike the common masks on the market, which often contain a lot of collagen, the design of this mask is relatively restrained.

Only a very small amount of ingredients in this mask is collagen, which fully considers the limited absorption of the human body.

Zhang Shan thinks that if there is a chance, maybe he can give Mu Zhianli a little bit.

After all, this method of using resources with restraint is very environmentally friendly, which should be in line with Kizhi's environmental protection philosophy.

After being treated several times by Zhang Shan, Luo Changhui seemed to have adjusted

I can get used to this new mask after adjusting.

Thinking again about the Regal Happy Water that Zhang Shan gave her before, she really didn't expect that Zhang Shan had the potential to become the leader of the Pfizer empire.

Luo Changhui felt that the reason why Zhang Shan had such strength was not because of these products.

The main reason is that Zhang Shan is too
　Ask for tickets, all kinds of tickets
　　
　
(End of this chapter)