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Liu Xin (scholar)

Liu Xin (scholar) is a mathematics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Liu Xin (scholar) rather than just read about it. In short: Liu Xin (c. 46 BCE – 23 CE), courtesy name Zijun, was a Chinese astronomer, classicist, imperial librarian, mathematician, and politician during the Western Han and Xin dynasties. He later changed his name to Liu Xiu (劉秀) due to the naming taboo of Emperor Ai of Han.

Liu Xin (scholar) — main illustration
Liu Xin (scholar) — illustration

Key takeaways

  • Liu Xin (scholar) belongs to mathematics; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Liu Xin (scholar) to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Liu Xin (scholar) from memory before moving on to harder problems.

Reference excerpt

Liu Xin (c. 46 BCE – 23 CE), courtesy name Zijun, was a Chinese astronomer, classicist, imperial librarian, mathematician, and politician during the Western Han and Xin dynasties. He later changed his name to Liu Xiu (劉秀) due to the naming taboo of Emperor Ai of Han. He was the son of Imperial librarian Liu Xiang and an associate of other eminent thinkers such as the philosopher Huan Tan. Liu was a prominent supporter of the Old Text classics.

Early life Liu Xin was the son of Confucian scholar Liu Xiang (77–6 BCE). Liu was a distant relative of Liu Bang, the founder of the Han dynasty, and was thus a member of the ruling dynastic clan (the Liu family). Liu Xin's paternal grandfather ranked as a hou (侯, roughly 'marquess'). As a young man, Liu helped his father in cataloguing the contents of the imperial library, and his friendship with the well-connected minister Wang Mang brought him power and rewards, rising under Emperor Ai of Han to the rank of Palace Attendant and Chief Commandant of Imperial Equipages (侍中奉車都尉).

Literary work

Librarian As a curator of the imperial library he was the first to establish a library classification system and the first book notation system. At this time the library catalog was written on scrolls of fine silk and stored in silk bags. Liu Xin's Qilüe (七略; "Seven Surveys") has not survived, but it formed the basis for the later bibliographic treatise Yiwenzhi (藝文志; "Treatise on Arts and Letters") in the Book of Han, which acted as a model for later imperial bibliographies. As the imperial librarian, Liu Xin both catalogued and annotated or edited ancient texts. These projects of his produced what became definitive texts of a number of orthodox canons of Chinese philosophy and history. Liu Xin played an important role in the transmission of the Zuozhuan. A scholar of the Old Text School, he was attracted to the Zuozhuan's earlier graphical forms, whose inaccessibility deterred the compound exegesis found in the rival Chunqiu commentarial traditions. In editing the Zuozhuan with the assistance of Yin Xian (尹咸), Liu rearranged the material into chronological order to map more neatly onto the Chunqiu chronicle as the Gongyang and Guliang commentaries did. He aimed to have an imperial academician assigned to the work, a crucial bureaucratic step towards canonization in the official orthodoxy. Liu's advocacy for the Zuozhuan was controversial in his own day, partly due to its lineage and prior reputation, and partly due to his own approach towards the situation. This scholarly dispute is sometimes taken as evidence for a larger dispute about classic texts written using variant scripts.

Old Text proponent During Liu Xin's career, there may have been some debate about certain texts called guwen (古文, "Ancient Script Texts"). One set of manuscripts discovered by Kong Anguo in the Western Han was consistently labeled as guwen owing to the graphical forms it preserved, a script which had diverged during the Eastern Zhou from the more conservative script of the state of Qin which became the official and only standard following their unification in 221 BCE. As a consequence of the variant graphical forms, parts of the text were already difficult to decipher for Han scholars. It is not clear to what extent the content of guwen works differed from the transmitted versions of the same titles, nor what criteria allowed for labeling a document guwen. It may have been the case that even a handful of words would suffice to impart this characteristic upon the text that contained them. Liu Xin was attracted to guwen texts, and his position in the imperial library meant he was well placed to ensure that these versions would officially be considered the authoritative ones.

Integrity of transmitted literature From the 19th through early 20th centuries, antiquarians and historians, beginning with Kang Youwei, accused Liu of excessive editing, to the point of falsifying historical texts. These criticisms were systematically analysed by the Doubting Antiquity School of historians. According to their theory, first articulated by Qian Mu in 1930, Liu edited ancient texts for political purposes, particularly the Rites of Zhou, the Zuozhuan, and the Mao commentary to the Shijing. This accusation of forgery had legitimate precedent: in the late 17th century Yan Ruoqu demonstrated that the transmitted Classic of History was mostly a forgery dating to the 4th century. This text had been based on the Ancient Script version, and only the parts that were present in the separately transmitted New Script version could be considered authentically early. Liu Xin was a political ally of the powerful and divisive minister Wang Mang, who would go on to usurp the Han dynasty around the turn of the millennium for a brief period known as the Xin dynasty. As the imperial librarian, Liu had the power to establish the definitive redactions of ancient texts and expunge variant versions. According to his accusers, the librarian falsified accounts of ancient historical events, and inserted into the legendary lineage of ancient rulers figures or relationships that were either invented, or borrowed from separate legends. In this way, he created a narrative of ancient rulers and successive dynasties which satisfied the "five phases" theory, wherein each ruler and/or dynasty represented one of the five traditional Chinese elements (wuxing), between which the Mandate of Heaven rotated. An account thus falsified would satisfactorily explain the rule of the Han and Xin dynasties in terms of the phases they were said to represent, and according to the forgery theory, Liu Xin's edited account conveniently showed a series of successions between various claimed ancestors of the Han and Xin houses. The possibility of Liu Xin's forgeries became a crucial question for the Doubting Antiquity School in their search for a rationalist past for China. They drew evidence from discrepancies between the texts edited by Liu and earlier or contemporaneous texts. For example, figures or events appearing in Liu's edited versions did not appear in earlier or contemporaneous texts. The forgery theory has been largely discredited.

Scientific work

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Liu Xin (scholar)

Start with the simplest possible case. Write down what Liu Xin (scholar) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In mathematics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Liu Xin (scholar) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Liu Xin (scholar) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Liu Xin (scholar)

In research
Liu Xin (scholar) appears in mathematics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Liu Xin (scholar) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Liu Xin (scholar) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1st-century BC Chinese astronomers, 1st-century BC Chinese historians, 1st-century BC Confucianists, so understanding it makes those chapters shorter.
In everyday life
Look for Liu Xin (scholar) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Liu Xin (scholar) in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Liu Xin (scholar) means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Liu Xin (scholar) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Liu Xin (scholar) in simple terms?

Liu Xin (c. 46 BCE – 23 CE), courtesy name Zijun, was a Chinese astronomer, classicist, imperial librarian, mathematician, and politician during the Western Han and Xin dynasties. He later changed his name to Liu Xiu (劉秀) due to the naming taboo of Emperor Ai of Han.

Why does Liu Xin (scholar) matter?

Because it connects several mathematics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Liu Xin (scholar)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Liu Xin (scholar).

Tags

  • 1st-century BC Chinese astronomers
  • 1st-century BC Chinese historians
  • 1st-century BC Confucianists
  • 1st-century BC mathematicians
  • 1st-century Chinese astronomers
  • 1st-century Chinese historians
  • 1st-century Chinese writers
  • 1st-century mathematicians
  • 23 deaths
  • Chinese Confucianists
  • Chinese librarians
  • Han dynasty government officials

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