But aside from Zu Chongzhi, Huaxia also had quite a few standouts in the field of mathematics.

And they can be classified into many categories based on their contributions and directions.

For example, regarding influence on modern mathematics, Qin Jiushao undoubtedly deserves to be at the forefront.

Because only his Great Derivation Technique and Chinese Remainder Theorem from native mathematics are preserved by modern math.

The rest of Huaxia's various ancient mathematical techniques and tools were reinvented by Western mathematicians.

In terms of groundbreaking innovation.

Then unquestionably, Liu Hui and Zhu Shijie lead, as they represent two major leaps on the two mathematical peaks of Huaxia:

Liu Hui organized the entire body of mathematical knowledge from the Qin and Han periods, establishing an overall framework for ancient Huaxia mathematics, summarizing the overall computational framework of linear algebra.

Broadly similar to Euclid in Greek mathematics.

Zhu Shijie organized math since the Tang and Song, standardizing the mathematical framework of Celestial Essence Skill, advancing Huaxia algebra from signless to signed computation.

And in the field of trigonometry, Jia Xian is without a doubt a standout among standouts.

Remember the Yang Hui's Triangle mentioned in Dungeon 1665?

The Yang Hui's Triangle was actually proposed by Jia Xian, which is why some call it Jia Xian's Triangle.

However, due to the loss of his works, his excellent ideas were recorded by another great mathematician, Yang Hui.

Thus, later generations defined this pattern by the name Yang Hui's Triangle.

The reason given by the Asian Mathematics Conference 11 years ago was that Yang Hui's records had physical proof, and there's nothing wrong with this logic actually.

Additionally,

Jia Xian also created the square root methods "Multiplication and Square Root Method" and "Multiplicative Opening Method,"

which are a class of efficient methods for solving numerical solutions to high-degree polynomials.

That's right.

Solving numerical solutions to high-degree polynomials.

You know?

In those years in Europe, they were still using "Roman Numerals."

That's right, numerals, even representing numbers was very difficult, not to mention such complex square root calculations.

The computational procedure of Jia Xian's Multiplicative Opening Method was roughly the same as the method of the European mathematician Horner (1819), but it was 770 years earlier.

And this is precisely an important link in the precision calculation of mirrors, and there are many derivative numerical formulas to solve.

In other words.

From both a capability and a professional perspective, Jia Xian is a much more suitable candidate than Han Gonglian.

But at the same time.

He is also a figure outside of Xu Yun's plan, someone Xu Yun never even considered at the beginning.

Because nobody knows Jia Xian's exact birth and death dates either, by most accounts, he passed away before Emperor Huizong of Song ascended the throne.

According to the Song History: Art and Literature,

Jia Xian completed the work Emperor Huang's Nine Chapters on Mathematical Art around 1050, at which time he held the position of Left Palace Attendant.

Left Palace Attendant is one of the three classes, a Standard Ninth-Rank Official.

According to the comparison table of Song Dynasty official positions and ages collected by later generations, the Left Palace Attendant was generally held by adult men aged 25-35.

Meanwhile, Wang Shu wrote in the National Annals:

"Xian is now the Left Palace Attendant, Jili Tai Shi. His calculations are mysterious, and there are books passed down in the world."

Wang Shu wrote National Annals in 1043, and it was completed in the autumn of 1045.

So.

In 1045, Jia Xian was at least 25 years old.

It is now 1100, a good 55 years later.

If Jia Xian were still alive, he would be at least eighty, possibly ninety or older.

Old Su, although he's also in his eighties, who is he?

A former Prime Minister!

His standard of living and access to healthcare could be said to be one in ten thousand or even one in a million.

But Jia Xian was just an ordinary minor official and quit his job not long after.

In terms of living standards, he was far below Old Su, at most at the level of a small landlord, maybe not even that well-off.

Thus, in the later mathematical community, most people believe Jia Xian passed away when Emperor Huizong ascended.

Even in encyclopedic entries, he is defined as an 'outstanding mathematician of the first half of the eleventh century.'

But as it seems now...

Jia Xian is actually still alive?

Moreover, according to Old Su's words,

If persuaded, he might even come over from Yingtian Prefecture!

Yingtian Prefecture is the later Bai Xia, and Bianjing is Junyi.

It is more than six hundred kilometers from Bai Xia to Bianjing; in later times, a bullet train takes three hours, so in the ancient times, it would indeed count as a long journey.

So from this, we can reason.

That currently Jia Xian's physical condition is probably quite good; otherwise, he wouldn't be able to handle such long-distance travel.

What can be said...

Though unexpected, this is undoubtedly good news.

After all, Xu Yun's goal is far beyond just an astronomical telescope...

Some things, unlike the astronomical telescope, although outwardly claiming incapability, can be easily calculated with their own ability.

For those calculations, even with Xu Yun's personal ability, it is an insurmountable task and external assistance is necessary.

Therefore, in response to Old Su's suggestion, Xu Yun promised on the spot:

"I have long been in spiritual communion with Mr. Tongyu. With his help, the telescope matter may succeed!"

Subsequently, Old Su mentioned a few more names to Xu Yun, all mathematicians who are leisure and staying within twenty or thirty miles around Bianjing.

Among them, Xu Yun had heard of one or two names, but their capabilities were much inferior to Jia Xian and Han Gonglian, considered as high-level talent types.

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