mathematics

Sword of Peter

Sword of Peter 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 Sword of Peter rather than just read about it. In short: The Sword of Saint Peter (Polish: Miecz świętego Piotra) is a religious relic held in the Poznań Archdiocesan Museum. It is claimed to be the sword with which the Apostle Peter cut off the right ear of the high priest's servant at the time of Jesus' arrest in Gethsemane.

Key takeaways

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

Reference excerpt

The Sword of Saint Peter (Polish: Miecz świętego Piotra) is a religious relic held in the Poznań Archdiocesan Museum. It is claimed to be the sword with which the Apostle Peter cut off the right ear of the high priest's servant at the time of Jesus' arrest in Gethsemane. The sword is wide-tipped, similar in shape to a dussack or machete. An exact copy of the sword, made by Bogdan Puchalski, is displayed on the wall of the Poznań Archcathedral Basilica.

History The sword is mentioned for the first time in 1609 in Vitae Episcoporum Posnaniensium of Jan Długosz as being the original Roman sword, or gladius, used by Saint Peter in the Gospels, or a direct copy made for Pope Stephen VII. However, at that time Stephen was already dead, and the current pope was John XIII. The sword arrived in Poznań in 968 as a gift from John XIII for either Bishop Jordan or Duke Mieszko I. The Archdeacon of Poznań Cathedral in 1699 wrote about the sword, describing it as a part of Saint Peter's sword brought to Poznań by Bishop Jordan, where it was usually kept in the cathedral treasury, except for the few times a year when it was shown to the people. The 1721 Decree of Poznań Cathedral Chapter refers to having the sword moved to the chapter house as a more proper placement for the artifact.

Folklore According to British folklore, St. Joseph of Arimathea brought the sword to Britain, and it was kept at Glastonbury Abbey for many years until the abbot gave it to Saint George.

Description The blade was made from a single piece of iron with an added small cross-guard Total length: 70.2 centimetres (27.6 in), it was probably 1 or 2 cm longer, but the tip of the sword was destroyed by corrosion Maximal width, at the tip: 9.4 cm (3.7 in) There is a hole 10.3 cm (4.1 in) from the end of the hilt, which is 0.4 cm (0.2 in) in diameter

References

Further reading Rola, Zygmunt (2000). Tajemnice Ostrowa Tumskiego (in Polish). Kraków: Zysk i S-ka. ISBN 978-83-7150-835-6.

Illustrations

Worked examples

Example 1 — a first encounter with Sword of Peter

Start with the simplest possible case. Write down what Sword of Peter 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 Sword of Peter 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 Sword of Peter 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 Sword of Peter

In research: Sword of Peter 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 Sword of Peter 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: Sword of Peter is common in secondary-school and first-year university syllabi. It links to neighbouring topics Christian mythology, Christian relics, Forgery controversies, so understanding it makes those chapters shorter.
In everyday life: Look for Sword of Peter 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 Sword of Peter in 20 minutes

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

Frequently asked questions

What is Sword of Peter in simple terms?

Why does Sword of Peter 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 Sword of Peter?

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 Sword of Peter.