physics

Res Jost

Res Jost is a physics 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 Res Jost rather than just read about it. In short: Res Jost (10 January 1918 – 3 October 1990) was a Swiss theoretical physicist, who worked mainly in constructive quantum field theory. Biography Res Jost was born on January 10, 1918, in Bern.

Key takeaways

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

Reference excerpt

Res Jost (10 January 1918 – 3 October 1990) was a Swiss theoretical physicist, who worked mainly in constructive quantum field theory.

Biography Res Jost was born on January 10, 1918, in Bern. He is the son of the physics teacher Wilhelm Jost and Hermine Spycher. In 1949 Jost married the Viennese physicist Hilde Fleischer. Jost studied in Bern and at the University of Zurich, where he received his doctorate in 1946 under the supervision of the German physicist Gregor Wentzel. He then spent half a year with Niels Bohr in Copenhagen, where he introduced the Jost function into scattering theory. Afterwards, he worked as an assistant of Wolfgang Pauli in Zurich. From 1949 to 1955 he was at the Institute for Advanced Study in Princeton, where he worked with Walter Kohn, Joaquin Mazdak Luttinger and Abraham Pais among others. From 1955, he was associate professor for theoretical physics at ETH and starting from 1959 full professor. In 1964, he and Rudolf Haag created the journal Communications in Mathematical Physics. He died on October 3, 1990, in Zurich. Jost researched quantum-mechanical scattering theory (also inverse scattering theory: Reconstruction of potentials from scattering data) and the mathematical quantum field theory, where he in 1958 with the methods of Arthur Strong Wightman proved the PCT theorem and in 1957 introduced the Jost–Lehmann–Dyson representation (named after Jost, Harry Lehmann and Freeman Dyson), an integral representation of the expectancy value of the commutator of two field operators.

Honors and awards Since 1977 Jost was corresponding member of the United States National Academy of Sciences. In 1984 Jost received the Max Planck Medal for outstanding achievements in theoretical physics.

Selected works Jost, Res (1965). The general theory of quantized fields. Vol. 4. American Mathematical Society. ASIN B0007DUAUK. Jost, Res (1995). Hepp, Klaus; Hunziker, Walter; Kohn, Walter (eds.). Das Märchen vom Elfenbeinernen Turm. Reden und Aufsätze. Lecture Notes in Physics Monographs (in German). Vol. 34. Springer-Verlag Berlin Heidelberg. doi:10.1007/978-3-540-49276-4. ISBN 978-3540492764. Jost, Res; Schneider, Walter (1969). Quantenmechanik: nach Vorlesungen im Wintersemester 1966/67 (in German). Vereins der Mathematiker und Physiker an der ETH Zürich. Jost, Res; Italian Physical Society, eds. (1969). Local quantum theory. Vol. 45. Academic Press. ISBN 9780123688453. Jost, Res (1984). "Erinnerungen: Erlesenes und Erlebtes". Physikalische Blätter (in German). 40 (7): 178–181. doi:10.1002/phbl.19840400706.

Illustrations

Worked examples

Example 1 — a first encounter with Res Jost

Start with the simplest possible case. Write down what Res Jost claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Res Jost 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 Res Jost 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 Res Jost

In research: Res Jost appears in physics 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 Res Jost 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: Res Jost is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1918 births, 1990 deaths, 20th-century Swiss non-fiction writers, so understanding it makes those chapters shorter.
In everyday life: Look for Res Jost 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 Res Jost in 20 minutes

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

Frequently asked questions

What is Res Jost in simple terms?

Res Jost (10 January 1918 – 3 October 1990) was a Swiss theoretical physicist, who worked mainly in constructive quantum field theory. Biography Res Jost was born on January 10, 1918, in Bern.

Why does Res Jost matter?

Because it connects several physics 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 Res Jost?

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 Res Jost.