mathematics

Pierre Frédéric Sarrus

Pierre Frédéric Sarrus 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 Frédéric Sarrus rather than just read about it. In short: Pierre Frédéric Sarrus (French pronunciation: [pjɛʁ fʁedeʁik saʁy]; 10 March 1798, Saint-Affrique – 20 November 1861) was a French mathematician. Sarrus was a professor at the University of Strasbourg, France (1826–1856) and a member of the French Academy of Sciences in Paris (1842).

Key takeaways

Pierre Frédéric Sarrus 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 Frédéric Sarrus to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pierre Frédéric Sarrus from memory before moving on to harder problems.

Reference excerpt

Pierre Frédéric Sarrus (French pronunciation: [pjɛʁ fʁedeʁik saʁy]; 10 March 1798, Saint-Affrique – 20 November 1861) was a French mathematician. Sarrus was a professor at the University of Strasbourg, France (1826–1856) and a member of the French Academy of Sciences in Paris (1842). He is the author of several treatises, including one on the solution of numeric equations with multiple unknowns (1842); one on multiple integrals and their integrability conditions; and one on the determination of the orbits of the comets. Sarrus discovered a mnemonic rule for solving the determinant of a 3-by-3 matrix, named rule of Sarrus. He also demonstrated the fundamental lemma of the calculus of variations. Additionally, he also developed the Sarrus linkage, the first linkage capable of transforming rotary motion into perfect straight-line motion, and vice versa. Sarrus numbers (Fermat pseudoprimes to base 2) are also named after Sarrus, who discovered the first number (341).

References

Worked examples

Example 1 — a first encounter with Pierre Frédéric Sarrus

Start with the simplest possible case. Write down what Pierre Frédéric Sarrus 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 Frédéric Sarrus 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 Frédéric Sarrus 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 Frédéric Sarrus

In research: Pierre Frédéric Sarrus 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 Frédéric Sarrus 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 Frédéric Sarrus is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1798 births, 1861 deaths, 19th-century French mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Pierre Frédéric Sarrus 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 Frédéric Sarrus in 20 minutes

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

Frequently asked questions

What is Pierre Frédéric Sarrus in simple terms?

Why does Pierre Frédéric Sarrus 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 Frédéric Sarrus?

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 Frédéric Sarrus.