astronomy

Shai Evra

Shai Evra 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 Shai Evra rather than just read about it. In short: Shai Evra (Hebrew: שי אברה) is a mathematician at the Hebrew University of Jerusalem specialising in representation theory. He was awarded the SASTRA Ramanujan Prize in 2020.

Key takeaways

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

Reference excerpt

Shai Evra (Hebrew: שי אברה) is a mathematician at the Hebrew University of Jerusalem specialising in representation theory. He was awarded the SASTRA Ramanujan Prize in 2020. He researches symmetric spaces of arithmetic groups. According to the SASTRA Ramanujan Prize citation, Shai Evra was selected for the prize for his outstanding work on ". . . high dimensional expanders in the area of combinatorial and geometric topology and on Golden Gates for three dimensional unitary groups. He employed deep results from representation theory and number theory, pertaining to the Generalised Ramanujan Conjectures. The prize recognises his fundamental paper in the Journal of Topology and Analysis, in which he extends both the combinatorics and automorphic form theory to generalise the construction of Mikhail Gromov and others on expander graphs. His fundamental work will have major implications even outside mathematics, extending into theoretical computer science, according to the citation." Shai Evra was born in Israel. He had his education at the Hebrew University of Jerusalem earning the B Sc degree in 2012, M Sc degree in 2013 and Ph D degree in 2019. His research supervisor was Alexander Lubotzky. He has been a postdoctoral researcher at the Institute for Advanced Study (2018–2020) and is an instructor at Princeton University for 2020–2021. He subsequently returned to the Hebrew University of Jerusalem as a senior lecturer in the Einstein Institute of Mathematics.

Other honours The other recognitions Evra had earned include Clore Scholarship instituted by Clore Israel Foundation (2016), the Perlman Prize, Hebrew University of Jerusalem (2014) and the Zafriri Prize, Hebrew University of Jerusalem (2014).

References

Worked examples

Example 1 — a first encounter with Shai Evra

Start with the simplest possible case. Write down what Shai Evra 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 Shai Evra 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 Shai Evra 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 Shai Evra

In research: Shai Evra 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 Shai Evra 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: Shai Evra is common in secondary-school and first-year university syllabi. It links to neighbouring topics Academic staff of the Hebrew University of Jerusalem, Hebrew University of Jerusalem alumni, Israeli mathematicians, so understanding it makes those chapters shorter.
In everyday life: Look for Shai Evra 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 Shai Evra in 20 minutes

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

Frequently asked questions

What is Shai Evra in simple terms?

Shai Evra (Hebrew: שי אברה) is a mathematician at the Hebrew University of Jerusalem specialising in representation theory. He was awarded the SASTRA Ramanujan Prize in 2020.

Why does Shai Evra 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 Shai Evra?

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 Shai Evra.