Why are some of Euler's discoveries named after other scientists? Detailed answer

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Why are some of Euler's discoveries named after other scientists? Detailed answer

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Why are some of Euler's discoveries named after other scientists?

Leonhard Euler made a huge number of discoveries. A large number of physical and mathematical objects are named in his honor, and more than once: there are several Euler formulas, Euler equations, Euler theorems, Euler numbers. To avoid too much ambiguity, some of these discoveries and theorems are named after the scientists who first made or proved them after Euler.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Why is a black cat considered a bad omen?

Today, millions of people believe that if a black cat crosses the road, bad luck will soon follow. This religious prejudice originated many thousands of years ago.

The ancient Egyptians worshiped the cat and considered it sacred. They had a goddess named Pasht, who had a cat's head. The Egyptians believed that their goddess Pasht had nine lives. This explains why many people continue to think that a cat has nine lives. When a cat died in ancient Egypt, a mummy was made.

A graveyard has been discovered containing thousands of black cat mummies! When people believed in the existence of witches, they associated the black cat with the witch. They believed that black cats were witches in disguise. Killing a cat did not mean killing a witch, since a witch could take the form of a cat nine times.

In the Middle Ages, it was believed that witches and sorcerers always used the brain of a black cat to make a mysterious potion. As a result of all these associations, the black cat has become a symbol of bad luck.

Test your knowledge! Did you know...

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Random news from the Archive

Characters and musical tastes 10.08.2015

It is unlikely that anyone will argue that our musical tastes depend on personality traits. But is it possible to say something about a person by the music that he listens to: for example, that love for one style or direction betrays an analytical mindset, and love for another - more inconstancy, unreliability of character?

Relevant studies have been conducted, but usually the emphasis has been on personality traits such as extraversion, neuroticism, openness to new things, etc. David Greenberg from Cambridge, together with colleagues, decided to build an experiment differently - they wanted to find out if music indicates cognitive or cognitive abilities. These abilities were considered in a wide range: for example, on one side were high empathic skills, involving immersion in the thoughts and feelings of another person, and on the other - the ability to systematize, to analyze complex phenomena and identify patterns in them.

As part of a psychological test, four thousand volunteers were offered several statements, for example: "I always feel when a person says one thing and thinks another" or "When I buy audio equipment, I always pay attention to technical details" - the participants in the experiment had to determine how much such definitions apply to themselves. Then they were given to listen to 50 musical compositions of various genres - the music had to be rated as liking or disliking on a 9-point scale. Well, then the answers to the psychological test were compared with musical sympathies.

In an article in PLoS ONE, the authors write that those with good empathy liked modern rhythm and blues, soft rock, and what is called mellow music, which is characterized by a soft and pleasant sound. In general, it was not too energetic music, often saturated with negative emotions and, as they say, with emotional depth. Systematizing, analytical properties were those who liked energetic, intense music with positive emotions and / or relatively complex arrangement. Specific authors and performers here could be very different: for example, empaths most of all liked the song "All of me" by the great jazz singer Billie Holiday and "Crazy little thing called love" by Queen, and "analysts" - one of Scriabin's etudes, "God save the Queen" by The Sex Pistols and "Enter Sandman" by Metallica. According to the authors of the work, the selected emotional and cognitive parameters of the personality coincided much more clearly with musical tastes than openness to new experience, extroversion, etc. - in the sense that it was possible to more accurately say what kind of music would be liked by the psychological test.

The results obtained well illustrate the well-known truth that we perceive music (and indeed any art in general) with the mind and heart, that is, direct emotional perception is combined with an analysis of what we have heard, and in different music the proportion here shifts in one direction or another. From a practical point of view, this may be of interest not only to those who, roughly speaking, sell music, but also to teachers - obviously, in order for a person to become interested in music, it must at least at first completely coincide with his psychological attitudes.

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