astronomy

Gijs de Leve

Gijs de Leve 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 Gijs de Leve rather than just read about it. In short: Gijsbert "Gijs" de Leve (15 August 1926 – 19 November 2009) was a Dutch mathematician and operations researcher, known for his work on Markov decision process. Gijs de Leve is considered the founder of operations research in the Netherlands.

Key takeaways

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

Reference excerpt

Gijsbert "Gijs" de Leve (15 August 1926 – 19 November 2009) was a Dutch mathematician and operations researcher, known for his work on Markov decision process. Gijs de Leve is considered the founder of operations research in the Netherlands.

Biography Born in Amsterdam, De Leve received his MA in Mathematics and Physics in 1954 at the University of Amsterdam. There he also received his PhD cum laude in 1964 for the thesis Generalized Markovian decision processes, advised by Jan Hemelrijk and Johannes Runnenburg. De Leve was appointed professor in operations research, in particular management scientific applications, at the University of Amsterdam in 1972. Among his doctorate students were Henk Tijms (1972), Alexander Rinnooy Kan (1976), Jan Karel Lenstra (1976), P. Weeda (1978), Awi Federgruen (1978), Antoon Kolen (1982), Roy Jonker (1986), Anton Volgenant (1987), Jeroen de Kort (1992), Erik H.J. van der Sluis (1993), Nanda Piersma (1993) and Cees Duin (1994). He retired from the University of Amsterdam on 1 September 1991. In honor of De Leve, in 1997 the Gijs de Leve prize was initiated for the best PhD thesis in the area of mathematics of operations research.

Publications Overzicht van een aantal artikelen over "Operations Research". Volume 1. G. de Leve, Jacobus Kriens, 1955. Enige statistische aspecten van de factoranalyse. G. de Leve, 1956 Operations research: Inleidende voorbeelden. Hoofdstuk 1. J. Kriens, G. de Leve, 1959 Oriënterende cursus mathematische besliskunde. G. de Leve, Stichting Mathematisch Centrum. Afdeling Mathematische Statistiek, 1962. Generalized Markovian decision processes – Deel 2. G. de Leve, 1964 Generalized Markovian Decision Processes: Model and method. Gijs de Leve, 1964 Inleiding in de besliskunde. G. de Leve, J.C. van Dalen, Stichting Mathematisch Centrum, 1970 Articles, a selection

Leve, Gijsbert. "Wie beslist er eigenlijk*." Statistica Neerlandica 20.2 (1966): 155–169. De Leve, Gijsbert, Awi Federgruen, and Hendrik C. Tijms. "A general Markov decision method I: model and techniques." Advances in Applied Probability (1977): 296–315. Federgruen, A. "Some approximation approaches in large-scale." Twenty-five years of operations research in the Netherlands: papers dedicated to Gijs de Leve 70 (1989): 35.

References

External links Prof. dr. G. de Leve, 1926 - 2009 on the University of Amsterdam Album Academicum

Worked examples

Example 1 — a first encounter with Gijs de Leve

Start with the simplest possible case. Write down what Gijs de Leve 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 Gijs de Leve 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 Gijs de Leve 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 Gijs de Leve

In research: Gijs de Leve 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 Gijs de Leve 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: Gijs de Leve is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1926 births, 2009 deaths, Academic staff of the University of Amsterdam, so understanding it makes those chapters shorter.
In everyday life: Look for Gijs de Leve 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 Gijs de Leve in 20 minutes

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

Frequently asked questions

What is Gijs de Leve in simple terms?

Why does Gijs de Leve 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 Gijs de Leve?

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 Gijs de Leve.