mathematics

Vojtěch Rödl

Vojtěch Rödl 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 Vojtěch Rödl rather than just read about it. In short: Vojtěch Rödl (born 1 April 1949) is a Czech American mathematician, Samuel Candler Dobbs Professor at Emory University. He is noted for his contributions mainly to combinatorics having authored hundreds of research papers.

Key takeaways

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

Reference excerpt

Vojtěch Rödl (born 1 April 1949) is a Czech American mathematician, Samuel Candler Dobbs Professor at Emory University. He is noted for his contributions mainly to combinatorics having authored hundreds of research papers.

Academic Background Rödl obtained his PhD from the School of Mathematics and Physics at Charles University in 1976. His supervisor was Zdeněk Hedrlín. From 1973 to 1987 he lectured at the School of Nuclear and Physical Engineering at the Czech Technical University in Prague. He has held visiting positions in various institutions including McMaster University, University of Waterloo, Bell Laboratories, Microsoft, Charles University, Mathematical Institute of the Czech Academy of Science, Bielefeld University, as well as at Humboldt University in Berlin. He serves on the editorial board of several international journals. He has given lectures at many conferences, including plenary address in 2014 at the International Congress of Mathematicians in Seoul and an invited lecture in 1990 at the International Congress of Mathematicians in Kyoto. He has several joint publications with Paul Erdős, and so has Erdős number one.

Research Rödl has published more than four hundred papers, mostly in combinatorics. He is mostly known for his contributions to Ramsey theory, extremal problems, and probabilistic combinatorics.

Awards 1977 – Silver medal of the Union of Czechoslovak Mathematicians and Physicists 1985 – Czechoslovak State prize (jointly with Jaroslav Nešetřil) 1996 – Humboldt Prize 2005 – Felber Medal (Czech Technical University) 2011 – Bolzano Medal (Czech Academy of Science) 2012 – George Pólya Prize in Applied Combinatorics (jointly with Mathias Schacht) 2013 – Neuron Prize 2003 and 2017 Honorary doctorate (Technical University of Liberec and Czech Technical University Prague respectively) In 1983 with Péter Frankl he solved a 1000$ problem of Paul Erdős. Since 2010 Rödl has been a Foreign Fellow of the Czech Learned Society.

Books Nešetřil, Jaroslav; Rödl, Vojtěch, eds. (1991). Mathematics of Ramsey Theory. Algorithms and Combinatorics. Vol. 5. Springer. ISBN 0-387-18191-1. 2012 pbk reprint

See also Packing in a hypergraph Frankl–Rödl graph Hypergraph removal lemma

References

External links Vojtěch Rödl at the Mathematics Genealogy Project "Vojtěch Rödl's home page". Retrieved 2026-04-24.

Worked examples

Example 1 — a first encounter with Vojtěch Rödl

Start with the simplest possible case. Write down what Vojtěch Rödl 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 Vojtěch Rödl 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 Vojtěch Rödl 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 Vojtěch Rödl

In research: Vojtěch Rödl 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 Vojtěch Rödl 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: Vojtěch Rödl is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1949 births, 20th-century American mathematicians, 21st-century American mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Vojtěch Rödl 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 Vojtěch Rödl in 20 minutes

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

Frequently asked questions

What is Vojtěch Rödl in simple terms?

Why does Vojtěch Rödl 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 Vojtěch Rödl?

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 Vojtěch Rödl.