1. Liber Abaci is a mathematics book written by Fibonacci in 1202.
2. It introduced Hindu-Arabic numerals to Europe, replacing Roman numerals.
3. The book popularized the use of zero and decimal notation.
4. Liber Abaci discussed various mathematical concepts, including algebra and geometry.
5. Fibonacci used the book to promote practical applications of mathematics.
6. The book contained problems involving commercial calculations and currency exchange rates.
7. Liber Abaci influenced European mathematicians for centuries after its publication.
8. Fibonacci's famous sequence (0, 1, 1, 2, 3, 5...) was mentioned in the book.
9. The book played a significant role in advancing arithmetic in medieval Europe.
10. Liber Abaci helped lay the foundation for modern mathematics education systems.

Although other remanence-acquisition processes commonly occur isothermally (e.g., ARM and CRM), the term IRM is generally understood to involve the application and removal of a significant DC magnetic field, that is, one approaching the coercivity of ferrimagnetic materials (on the order of several millitesla to tens or hundreds of millitesla).

Such intense fields are rare in natural terrestrial environments, but IRMs can be imparted by lightning strikes