mathematics

Idun Reiten

Idun Reiten 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 Idun Reiten rather than just read about it. In short: Idun Reiten (1 January 1942 – 19 August 2025) was a Norwegian professor of mathematics. She was considered to be one of Norway's greatest mathematicians during her lifetime.

Key takeaways

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

Reference excerpt

Idun Reiten (1 January 1942 – 19 August 2025) was a Norwegian professor of mathematics. She was considered to be one of Norway's greatest mathematicians during her lifetime. With national and international honors and recognition, she had supervised 11 students and had 28 academic descendants as of March 2024. She was an expert in representation theory, and is known for work in tilting theory and Artin algebras.

Life and career Reiten took her PhD degree at the University of Illinois in 1971, becoming the second Norwegian woman to earn a PhD in mathematics; the first was Elizabeth Stephansen in 1902. She was appointed a professor at the University of Trondheim in 1982, now named the Norwegian University of Science and Technology. Her research area was representation theory for Artinian algebras, commutative algebra, and homological algebra. Her work with Maurice Auslander now forms the part of the study of Artinian algebras known as Auslander–Reiten theory. This theory utilizes such concepts as almost-split sequences and Auslander-Reiten quivers, which were developed in a series of papers. She died on 19 August 2025, at the age of 83.

Awards and honours In 2005, Reiten received the Humboldt Research Award. In 2007, Reiten was awarded the Möbius prize. In 2009 she was awarded Fridtjof Nansen's award for successful researchers, (in the field of mathematics and the natural sciences), and the Nansen Medal for Outstanding Research. In 2007, she was elected a foreign member of the Royal Swedish Academy of Sciences. She was also a member of the Norwegian Academy of Science and Letters, the Royal Norwegian Society of Sciences and Letters, and Academia Europaea. In 2012, she became a fellow of the American Mathematical Society. She was named MSRI Clay Senior Scholar and Simons Professor for 2012-13. She delivered the Emmy Noether Lecture at the International Congress of Mathematicians (ICM) in 2010 in Hyderabad and was an Invited Speaker at the ICM in 1998 in Berlin. In 2014, the Norwegian King appointed Reiten as commander of the Order of St. Olav "for her work as a mathematician". She is the namesake of the IDUN: From PhD to Professor program at the Norwegian University of Science and Technology Faculty of Information Technology and Electrical Engineering, which aimed at "increasing the number of female scientists in top positions at NTNU's Faculty of Computer Science and Electrical Engineering."

Illustrations

Worked examples

Example 1 — a first encounter with Idun Reiten

Start with the simplest possible case. Write down what Idun Reiten 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 Idun Reiten 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 Idun Reiten 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 Idun Reiten

In research: Idun Reiten 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 Idun Reiten 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: Idun Reiten is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1942 births, 2025 deaths, 20th-century Norwegian mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Idun Reiten 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 Idun Reiten in 20 minutes

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

Frequently asked questions

What is Idun Reiten in simple terms?

Idun Reiten (1 January 1942 – 19 August 2025) was a Norwegian professor of mathematics. She was considered to be one of Norway's greatest mathematicians during her lifetime.

Why does Idun Reiten 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 Idun Reiten?

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 Idun Reiten.