"Define 1, let V be a non-empty set and R be a field of real numbers. If for any two elements a, b∈V, there is always a unique element y∈V corresponding to it, which becomes the sum of a and b, denoted as y=a+b......"

The above is the definition and properties of linear space.

Add the dimension, basis and coordinates to deduce Definition 2 and Definition 3.

Through the linear operation of the basis transformation and the coordinate transformation, the definitions of linear changes 4, 5, and 6 can be deduced......

Xu Feng carried out a huge operation in the sea of knowledge, and wanted to build the foundation of the ethereal sword technique on this basis.

However, it didn't take long for Xu Feng to find that this seemed to be more widely used in formations.

As a result, Xu Feng accidentally immersed himself in the study of the formation.

"Like, it's crooked......"

Coming back to his senses, Xu Feng continued to deduce the ethereal sword technique.

Speaking of which, it's all to blame for the predecessor of Yang Hexing, why don't you study more when you get the ethereal sword technique?

"Forget it, blaming yourself is the same as blaming yourself, keep researching!"

A sword is gratuitous, ethereal and uncertain......

"Xu Feng hasn't eaten for a few days?" Zhou Lan asked.

"Six days. "Mengyunyan tasted the ice cream provided by the spaceship, and it tasted amazing.

Ever since Xu Feng said goodbye to Confucianism and returned to the Mars Branch, he has been in a state of muttering madness.

From time to time, a sentence or two of technical terms for advanced mathematics will pop out of my mouth, which seems to be unfathomable.

When saying goodbye to the Mars Branch, Xu Feng was reciting the basic score table.

When the chief of staff came to see him off, Xu Feng was talking about the Stoke formula.

When boarding the spaceship, Xu Feng was talking about linear transformation.

"Xu Feng, it can't be crazy, right?"

Zhou Lan's voice was low, worried about being heard.

"Professor Ouyang said that he was temporarily crazy, and he would return to normal after a while. ”

Each layer of ice cream has a taste, sweet and sour, delicious, and Mengyun eats it with relish.

Zhou Lan showed her little tiger teeth: "That, can I beat him up now?"

Coincidentally, Xu Feng walked out of the room, naturally came to the hall, and randomly found a place to sit in a daze.

Meng Yunyan picked up the juice: "You can try it, if you die, we won't help you collect the body." ”

Zhou Lan stuck out her tongue and didn't speak.

"Zheng Shao, Liu Shao, Long Shao, I didn't expect to meet you here!"

Not far away, the four young boys met and greeted each other.

"Zheng Shao's clothes are from Master Roland!"

"Liu Shao is not simple, the shoes on his feet are the masterpieces of Master Silan!"

"Long Shao, worthy of being the eldest young man of the Long family, this body is worth my salary for ten years. ”

Wei Shaojie was smiling, he was the second son of the president of the Martian Landis City Weishi Group, and he wanted to open up his own group, and this time he was going to the earth to develop.

I didn't expect to meet these three on the same spaceship, and if I can make friends, it will be of great help to his future development on Earth.

"It turned out to be Wei Shao. Long Yuchen smiled politely.

"Wei Shao, I haven't seen you for a long time. Liu Xiaoming nodded.

"Hello!" Zheng Yibiao is neither salty nor light.

He was in a very bad mood, and he had a rare opportunity to take his favorite actress to a yacht, but he didn't expect to be robbed by a neurotic who rowed a wooden boat by the waves.

If it weren't for luck, the junta search and rescue boat might have been swept away by the floodwaters.

Go back and tell his dad, who knows that his dad is like a ghost.

I helped him book a ticket to Earth overnight.

Tell me to go to the earth and be a good man.

Wait until the wind has passed and then return to Mars.

Zheng Yibiao is not a gentleman who doesn't know what to do.

Seeing the body of the actress being thrown into the river, you know the seriousness of the matter.

It's just that I'm very unwilling!

"It's all full...... Ah, there's still a place here, I'm going to get that guy out of the way!"

Seeing that Zheng Yibiao was in a bad mood, Wei Shaojie didn't care, looked around, and locked on to Xu Feng's location.

Xu Feng's head was little by little, and there were words in his mouth, and he was dozing off at a glance.

At such times, it would not be rude to persuade someone to leave.

After all, it's better to go back to your room to sleep or something.

Long Yuchen looked over: "Hey, Xu Feng, Wei Shaojie is too bold, should I save it." ”

Zheng Yibiao looked at it, and his eyes widened at that time!

This silhouette, this appearance, he will never forget, it is the guy who robbed the speedboat!

Soon, Zheng Yibiao calmed down.

There is a biao in his name, but it doesn't mean that he is a biaozi.

To tell the truth, people like Wei Shaojie grabbed a lot of them on Mars.

It's okay to say what his brother said, but now, let Wei Shaojie test the water.

"Friend, please get out of the way, there are four of us sitting here. "Wei Shaojie is polite.

"The dimensionality of linear space can be infinite, it can be infinite......" Xu Feng ignored the arriving Wei Shaojie.

"Dimensionality, infinite ......" Wei Shaojie was stunned, "Friend, can you get out of the seat?"

"The same element has different coordinates under different bases, and ...... between different bases and different coordinates"

As the saying goes: nothing more than three.

Wei Shaojie was ignored again, he was angry!

However, Long Shao, Liu Shao, and Zheng Shao are here, and he has to maintain his demeanor.

With a wave of his hand, two bodyguards walked out of the crowd, each of them a martial artist with internal strength and external strength.

"Er Shao, what do you need our help with?" the two warriors smiled.

"Your reward is indispensable. ”

"Okay!"

Seeing Long Yuchen, Zheng Yibiao, and Liu Xiaoming in the distance, the two warriors were in their hearts and responded loudly.

This kind of time to refute Wei Shaojie's face is obviously not a good choice.

glanced at Xu Feng, he was an ordinary student.

Helpless.

This kind of task is too easy and too simple.

"Friend, give way. ”

One of the martial artists reached out and grabbed Xu Feng.

"Linear Transformation ...... in Linear Space"

Shout!

An invisible sword aura emitted.

The arm fell to the ground, blood splattered.

The warrior with the broken arm screamed in pain and took a few steps back.

"Damn it!"

Another martial artist reached out with his claws and grabbed Xu Feng's throat.

Seeing that the brothers who experienced life and death together were killed by the murderer, they were angry.

This is his killer move when he walks on Mars, and he has gone through countless tests of life and death, and he has never missed.

Shout!

It was another sword qi, born out of nowhere.

The claws broke and fell to the ground.

"Ahh

Zhou Lan covered her mouth.

Just now, she wanted to take the opportunity to beat Xu Feng.

If she went up to do it just now, would she have broken her hand or broken foot?

"I'm so cute, I can't be crippled. ”

Zhou Lan watched silently.

Mengyun drank the juice and watched with interest.

The sword qi is spontaneous, this is by no means an ordinary True Qi Realm martial artist.

Wei Shaojie looked at Xu Feng, who was still talking about high math jargon, and fell to the ground.

"I remembered that there was something else, so let's go first. ”

Long Yuchen's heart twitched, and he walked away: "It's good that the junior didn't see me." ”

"My girlfriend is looking for me, go first. ”

Zheng Yibiao's heart was shocked, and he disappeared at the scene of the incident with Long Yuchen.

The rest of Liu Xiaoming looked left and right, pretending to be deep thinking and walking into the distance.

"Add the Fourier transform, I get it!"

Xu Feng came back to his senses and was extremely excited.

Blood?

Xu Feng looked at Wei Shaojie who was sitting on the ground, and the invisible coercion dispersed.

Suddenly, a smell of urine spreads...... 8)