Xu Feng sat cross-legged on the wooden boat, braving the wind and waves all the way to the south.

Taking advantage of his free time, Xu Feng began to study the "Ethereal Sword Technique".

Before, his realm was not enough, and he was not able to learn the sword moves.

Therefore, I only learned the basics of sword control and swordsmanship.

"Ethereal Kenichi!"

A sword is gratuitous, ethereal and uncertain.

This is the essence of the first form of the ethereal sword technique.

In just eight words, it seems very simple, but it is very difficult to achieve it.

Like 1+1, this mathematical formula is known to countless people.

But it is very difficult to prove.

In 1742, Goldbach wrote to the mathematician Euler about his conjecture, which Euler had not been able to prove until his death, and in his reply he proposed an equivalent version: any even number greater than 2 could be written as the sum of two prime numbers.

At the same time, Euler proposed another proposition: any even number greater than 2 is the sum of two prime numbers.

As soon as the conjecture came out, the entire mathematical community was in turmoil.

In 1920, Norway's Brown proved "9+9", and the mathematical community began to advance.

In 1965, the Soviet Union's Bucher Shitaibo and Vinogradov Jr., and Italy's Ponbilli proved the "1 + 3".

In 1966, China's Chen Jingrun proved "1 + 2".

From conjecture to proof 1+2, the process took more than 200 years, and then the proof stalled again.

It wasn't until 200 years ago that a mathematician living on Mars proved 1+1 and laid the foundation for human exploitation of extrasolar planetary resources.

This is the case with the first form of the Ethereal Sword Technique.

The difference is that mathematicians have proved that 1+1 can start from 9+9, while Xu Feng must start from 1+1, and the difficulty can be imagined.

Perhaps the use of linear space and linear transformations can solve this problem. ”

Xu Feng muttered to himself, immersed in the sword moves.

"The sword is in my hand, the sword is not in my hand, the sword, omnipresent? no, there is still a single element missing......

Half an inch out of the sheath, a sword qi shot straight into the void and disappeared without a trace.

It's just ordinary sword qi.

The sword qi was one after another, and Xu Feng unconsciously became selfless.

Until I heard the sound of a speedboat coming from a distance.

Xu Feng looked over.

"Yo-hoo!"

There was a man and a woman sitting on the speedboat.

The man wore a colorful shirt and shorts.

The woman wears sunglasses and a plaid skirt with a thin waist, which should be highlighted, and the thin one is thin, graceful and charming.

A man and a woman were screaming, excited.

"Zheng Shao, that wooden boat is so fast!"

"My little dear is not just a broken wooden boat, ah, it's really fast...... But Ben Dashao's speedboat is not vegetarian, hold me tight, it's time to accelerate!"

"Ah, Zheng Shao, you slow down, people can't stand it anymore. ”

"It's just a little broken wooden boat, hold on!"

The speedboat swerved sharply and accelerated, making a six-meter-high splash of water and approaching the wooden boat!

Pressing back the flying sword, Xu Feng blinked, this speedboat is good.

Indeed, riding on a wooden boat at such a fast speed.

It's too high-profile.

If you change to a speedboat, it will look normal.

"Yo, buddy, your wooden boat is fast, come and compare!"

Brother Gongzi on the speedboat waved!

"Okay!"

Xu Feng smiled slightly.

Brother Childe felt that something was wrong.

The wooden boat looks ordinary, but how did it sail so fast without pulp and thrusters?

Look at the waves that are more than two meters high behind the wooden boat.

Is it all about the waves......

The next second.

A man and a woman sat in a wooden boat.

Xu Feng sat on the speedboat and waved to the two.

"Thank you for the speedboat!"

"Ah......h

"Zheng Shao, what's going on?"

The woman hugged Zheng Shao tightly, not understanding what was going on.

They were still laughing at Xu Feng in the speedboat just now, but they didn't expect to sit in the wooden boat in the blink of an eye.

Moreover, the wooden boat stopped and could only go with the flow......

Xu Feng threw away the remaining low-grade spirit stones.

Embedded in the newly engraved pattern of the speedboat.

In the blink of an eye, the speed of the speedboat increased fivefold, setting off a stormy wave, and disappeared in the blink of an eye.

"My speedboat!"

The young man who remained in the wooden boat cried out miserably.

No one could hear him except the young woman who was still holding him tightly.

......

"Xu Feng, did you really have an accident?"

Liszt stood in front of the window with a red wine glass and looked at the magnificent scenery outside.

Aveline stood aside with a gloomy face, not commenting.

"Ruthless little Lori, what do you think?"

Liszt drank the red wine.

"Get out!" Aveline turned, "he can't die." ”

"Our cold little Lori has a good eye. Ah, by the way, Rulin Chunqiu held a special training for innate disciples in 19 months, and I signed you up. ”

"Hmm!"

Aveline walked out of the room without looking back.

Liszt continued to look at the scenery: "It is a coincidence that there has been no text message back until now, and the northern region has been flooded again. ”

......

The speed of the speedboat is almost as fast as that of a hoverplane.

It didn't take long for Xu Feng to see the land.

Xu Feng landed in a wilderness.

Let the speedboat load ashore and blow up into a scrap ship.

"The speed of the speedboat is too fast, and the time is far from enough for me to comprehend the first form of the Ethereal Sword Technique. ”

Xu Feng turned on his phone.

One by one, text messages and WeChat pop-ups came out.

There are those who dream of clouds, there are those who are chiefs of staff, there are those who are in the president's office of Tunghai University, and there are those who are in Liszt.

Mengyunyan: Xu Feng, where are the people, it's almost time to return to Earth!

Chief of Staff: Xu Feng, be careful.

Principal's Office: Take care!

Liszt: I'll write back if you survive, and I can pick you up.

"It seems that everyone cares about me. ”

Xu Feng smiled slightly, measured the lower position, and gave Liszt a location.

Liszt, who was still drinking red wine, smiled: "Xu Feng, I didn't expect it to be you." ”

Xu Feng turned off his mobile phone and rushed to the agreed coordinates.

A private hoverplane has been waiting for a long time.

"Confucianism Spring and Autumn, Zeng Wenxi. ”

"Xu Feng. ”

"Senior Brother Li asked me to wait here for Brother Xu to arrive, please get on the plane, and I will send you back to the Light of El. ”

"Trouble. ”

Sitting on the plane, Xu Feng was not at all worried that Rulin Chunqiu would pit him.

After all, you can fly, and you don't have to worry about falling from a high altitude or something.

Moreover, this Zeng Wenxi classmate has profound internal skills.

At a young age, he became an innate elite.

Ru Lin Chunqiu had no reason to gamble his life with a future pillar.

On the contrary, let Zeng Wenxi come to greet him, which is Liszt's sincerity.

Liszt was a disciple of Confucianism Chunqiu.

Serve the Martian junta.

Secretly helped him many times.

Liszt, or rather the Confucian Spring and Autumn behind him, must have been carrying out an extremely astonishing plan.

Xu Feng closed his eyes and continued to comprehend the Ethereal Sword Technique.

The first sword he must master.

......

A gloomy command room in the headquarters of the Sixth Theater of Operations of the Ground Alliance.

An intelligence officer cautiously walked into it: "Report, Xu Feng is back, intact." ”

The person in the seat looked gloomy: "It's good to be able to escape from the gray forest alive! It's a pity that you can't save the commander-in-chief." ”

......

The Fourth Hospital of Donghai City.

Groups of soldiers stormed the hospital and blocked all entrances and exits.

Hong Yanshan rushed into the ward, looked at the commander-in-chief on the hospital bed in a daze, and knelt down in a daze.