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2. Leitner system - Wikipedia

   en.wikipedia.org/wiki/Leitner_system

   An alternative method where incorrect answers are only moved back by one box. The Leitner system[1][2][3] is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. [4][5] It is a simple implementation of the principle of spaced repetition, where cards are reviewed at ...

3. Glossary of mathematical symbols - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_mathematical...

   Glossary of mathematical symbols. A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various ...

4. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Mathematics is a field of study that discovers and organizes methods, theories and theorems that are developed and proved for the needs of empirical sciences and mathematics itself. There are many areas of mathematics, which include algebra (the study of formulas and related structures), geometry (the study of shapes and spaces that contain ...

5. Caitlyn Jenner Posts Rare Photo with Brody Jenner and Kim ...

   www.aol.com/caitlyn-jenner-posts-rare-photo...

   Caitlyn Jenner; Brody Jenner; Kim Kardashian. Caitlyn Jenner celebrated her 75th birthday in the company of Brody Jenner and Kim Kardashian. On Tuesday, Oct. 29, the Olympic gold medal-winning ...

6. Flashcard - Wikipedia

   en.wikipedia.org/wiki/Flashcard

   A flashcard or flash card is a card bearing information on both sides, which is intended to be used as an aid in memorization. Each flashcard typically bears a question or definition on one side and an answer or target term on the other. Flashcards are often used to memorize vocabulary, historical dates, formulae or any subject matter that can ...

7. Volunteer pilots are flying supplies to trapped Hurricane ...

   www.aol.com/news/volunteer-pilots-flying...

   Victims of Hurricane Helene trapped in towns in North Carolina and Tennessee are getting help from volunteer pilots who are using their private aircraft to deliver necessities.