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astronomy

Louis Crelier

Louis Crelier is a astronomy 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 Louis Crelier rather than just read about it. In short: Louis Jacques Crelier (3 November 1873, Bure, Switzerland – 28 November 1935) was a Swiss mathematician. In 1886 he enrolled at l'Ecole normale in Porrentruy and then studied at the University of Berne, where he received his doctorate in 1895.

Key takeaways

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

Reference excerpt

Louis Jacques Crelier (3 November 1873, Bure, Switzerland – 28 November 1935) was a Swiss mathematician. In 1886 he enrolled at l'Ecole normale in Porrentruy and then studied at the University of Berne, where he received his doctorate in 1895. He began his teaching career at the secondary school in Saint-Imier and then taught at the technical school (founded in 1873) in Biel/Bienne. He became in 1912 professor extraordinarius and in 1918 professor ordinarius at the University of Berne. Crelier served a two-year term from 1920 to 1921 as president of the Swiss Mathematical Society. He was an Invited Speaker of the ICM in 1924 at Toronto and in 1928 at Bologna.

Selected publications Sur quelques propriétés des fonctions Besséliennes tirées de la théories des fractions continues. Milan: Imp. Bernardoni de C. Rebeschini et c.e. 1896. Systèmes cinématiques. Paris: Gauthier-Villars. 1911. "Puissance d'une droite par rapport à un cercle". Nouvelles annales de mathématiques. 17: 339–345. 1917. "Faisceaux de cercles relatifs à la puissance d'une droite". Nouvelles annales de mathématiques. 17: 290–297. 1917.

References

External links "A la mémoire de Louis Crelier, 1873-1935, docteur des sciences, professeur ordinaire à l'Université de Berne / offert par Mme Louis Crelier". helveticat.ch. (40 pages, List of publications by Louis Crelier, pp. 39–40)

Worked examples

Example 1 — a first encounter with Louis Crelier

Start with the simplest possible case. Write down what Louis Crelier claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Louis Crelier 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 Louis Crelier 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 Louis Crelier

In research
Louis Crelier appears in astronomy 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 Louis Crelier 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
Louis Crelier is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1873 births, 1935 deaths, Academic staff of the University of Bern, so understanding it makes those chapters shorter.
In everyday life
Look for Louis Crelier 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 Louis Crelier in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Louis Crelier 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 Louis Crelier out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Louis Crelier in simple terms?

Louis Jacques Crelier (3 November 1873, Bure, Switzerland – 28 November 1935) was a Swiss mathematician. In 1886 he enrolled at l'Ecole normale in Porrentruy and then studied at the University of Berne, where he received his doctorate in 1895.

Why does Louis Crelier matter?

Because it connects several astronomy 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 Louis Crelier?

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 Louis Crelier.

Tags

  • 1873 births
  • 1935 deaths
  • Academic staff of the University of Bern
  • Swiss mathematicians
  • University of Bern alumni

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