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Text 226 [Expansion plan ahead of schedule]

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    ,

    General Military Mansion.

    The courtyard where Xiong Wencan was received is now used to receive important guests, and a maid is hired to clean it.

    Today six scholars came, including Xiao Shixuan, who are all mathematics lovers.

    Since Xiao Shi was given the title of doctor of mathematics, and he was also paid according to the salary of the county magistrate, everyone knew that Zhao Han attached great importance to mathematics.  It is good at the top and effective at the bottom, and more and more people are learning mathematics.

    It's just that most of the scholars are still at the elementary school mathematics level.

    "Mr. Zhao!" The six scholars stood up in unison.

    Zhao Han smiled and raised his hand: "Sit down."

    After everyone sat down, they cast their gazes behind Zhao Han again, but it was Zhao Zhenfang who followed.

    There is a blackboard in the middle of the yard, and everyone sits on chairs around the blackboard.

    Zhao Han came to the blackboard and said, "You are all outstanding researchers in mathematics. I invite you to come today. The first thing is to establish a mathematics club. This math club is similar to the literature club. We usually exchange and discuss math problems. Everyone  A quarterly "Mathematics" publication will be published to publish the achievements you have made in the near future. This year, the General Military Office allocated twenty taels of silver for the establishment and development of the Mathematics Society."

    The six of them were very happy, they were all different types of scholars, and they did not expect to be so valued by Zhao Han.

    "The details of the Mathematics Society, you go down and discuss slowly," Zhao Han picked up the chalk made of chalk, "Today I will talk about two things, one is logarithm, and the other is analytic geometry."

    As a liberal arts student, Zhao Han had almost forgotten his advanced mathematics, and he had forgotten a lot of content in junior high school and high school.

    Analytical geometry should be learned in junior high school, and logarithm is the knowledge of the first grade of high school.  For these two things, Zhao Han only remembered the basics of the concepts, and had to rely on Xiao Shixuan and others to study them in depth.

    Zhao Han can't wait any longer, he must bring out the basic concepts, otherwise he will not be born in China until the Year of the Monkey.

    Because logarithms and analytic geometry are very important, and they are key mathematical tools for the development of astronomy, navigation, machinery, economy, military and other technologies.  In other words, it was the development of many fields such as astronomy, navigation, and machinery that forced the improvement of digital calculation methods, which gave birth to logarithm and analytic geometry in Europe.

    Without these two mathematical tools, the development of astronomy, navigation, and machinery will reach a bottleneck and it will be difficult to break through.

    Just this year, Descartes also came up with the concept of imaginary numbers.

    China was far behind at this time, but the appearance of Zhao Han narrowed the gap.  More than 90 years ago, the equal sign appeared in Europe, but it was not popularized until more than 40 years ago.  36 years ago, the greater than and less than symbols appeared in Europe; 6 years ago, the multiplication and division signs appeared in Europe; this year, Descartes used the root sign for the first time.

    At least, the mathematicians under Zhao Han used the root sign earlier than European mathematicians.

    Also in this year, Descartes founded analytic geometry!

    Zhao Han drew a cross coordinate system on the blackboard. The horizontal column marked the abbreviated symbol of "A", the vertical column marked the abbreviated symbol of "B", and the intersection point was marked as "0".

    Did you suddenly have an impression?

    This thing is analytic geometry, and it will be everywhere a few hundred years ago, but it is a novelty now.

    Following Zhao Han's strokes with chalk, the six scholars were both surprised and delighted, as if the door to a new world had been opened.

    The more Zhao Zhenfang listened, the more confused she became, as if what was written on the blackboard was a divine scripture.  She looked at the six people beside her, all of them paying attention, as if they all understood.

    Zhao Zhenfang felt that she was so weak, she had to study mathematics hard in the future.

    Because she felt that she was usually bored, she asked her brother for an errand to do something in the math club.  For example, helping to contact members, sorting out research successes, editing quarterly mathematics journals, etc.

    If she can't even understand other people's stuff, how can she edit the school journal?

    For one morning, Zhao Han only talked about the most basic things, mainly because he couldn't talk too deeply himself.  Throwing down the chalk, he said, "Everyone stay for dinner, I have business in the afternoon. Farewell!"

    "Congratulations to Mr. Zhao!"

    The six people stood up and bowed in unison, and then no one went to eat, and all took out their small books to read.

    "Did you understand?"

    "I understand everything, it's like enlightenment."

    "Especially the introduction of this variable is simply a stroke of genius, and many previous problems can be easily solved!"

    "Mr. Zhao is really a god!"

    ""

    The six sighed there, and then began to discuss.

    In fact, what they discussedAnd it must be more fierce every time!

    Both Pang Chunlai and Li Banghua panicked, fearing that Beijing would not be able to hold on.

    Really, this year's situation is too scary, most of China has suffered disasters.  The drought in Nanzhili and Zhejiang dealt the heaviest blow to Chongzhen, and its influence far exceeded that of Zhao Han's uprising in Jiangxi.

    The taxes of the Ming Dynasty are all supported by Nanzhili and Zhejiang!

    Zhao Han said: "Jianchang Prefecture was occupied by rebels, and Nanfeng County was stolen by religious bandits. I have ordered the army, officials and peasant associations to take action in advance."

    "It should be like this," Li Banghua said. "This year we must take all of Jianchang, Fuzhou, and Ruizhou. In this way, there will only be Nankang, Jiujiang, and Guangxin in Jiangxi. We will strive to occupy the whole of Jiangxi after the summer harvest next year."  territory."

    "I agree with this strategy." Pang Chunlai immediately agreed.

    Pang Chunlai is from Liaodong, and he knows how cruel the Tartars are.  North Korea's surrender made Pang Chunlai feel a sense of crisis, fearing that one day the Tartars would suddenly capture Beijing.

    At that time, if Chongzhen moved south and ruled with the Tartars, Jiangxi would become a thorn in the court's side.

    It is necessary to occupy Jiangxi as soon as possible, and then take Fujian, Guangdong and the southern part of Huguang, so that Chongzhen will definitely not dare to go to the south.
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