mathematics

Pierre Rosenstiehl

Pierre Rosenstiehl 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 Pierre Rosenstiehl rather than just read about it. In short: Pierre Rosenstiehl (5 December 1933 – 28 October 2020) was a French mathematician recognized for his work in graph theory, planar graphs, and graph drawing. The Fraysseix-Rosenstiehl's planarity criterion is at the origin of the left-right planarity algorithm implemented in Pigale software, which is considered the fastest implemented planarity testing algorithm.

Key takeaways

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

Reference excerpt

Pierre Rosenstiehl (5 December 1933 – 28 October 2020) was a French mathematician recognized for his work in graph theory, planar graphs, and graph drawing. The Fraysseix-Rosenstiehl's planarity criterion is at the origin of the left-right planarity algorithm implemented in Pigale software, which is considered the fastest implemented planarity testing algorithm. Rosenstiehl was directeur d’études at the École des Hautes Études en Sciences Sociales in Paris, before his retirement. He was a founding co-editor in chief of the European Journal of Combinatorics. Rosenstiehl, Giuseppe Di Battista, Peter Eades and Roberto Tamassia organized in 1992 at Marino (Italy) a meeting devoted to graph drawing which initiated a long series of international conferences, the International Symposia on Graph Drawing. He has been a member of the French literary group Oulipo since 1992. He married the French author and illustrator Agnès Rosenstiehl.

References

Illustrations

Worked examples

Example 1 — a first encounter with Pierre Rosenstiehl

Start with the simplest possible case. Write down what Pierre Rosenstiehl 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 Pierre Rosenstiehl 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 Pierre Rosenstiehl 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 Pierre Rosenstiehl

In research: Pierre Rosenstiehl 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 Pierre Rosenstiehl 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: Pierre Rosenstiehl is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1933 births, 2020 deaths, 20th-century French mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Pierre Rosenstiehl 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 Pierre Rosenstiehl in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pierre Rosenstiehl means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Pierre Rosenstiehl out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pierre Rosenstiehl in simple terms?

Why does Pierre Rosenstiehl 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 Pierre Rosenstiehl?

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 Pierre Rosenstiehl.