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этимология

a number of - перевод на голландский

NUMBER THAT, WHEN ADDED TO THE ORIGINAL NUMBER, YIELDS ZERO

Opposite number; Opposite (mathematics); Unary minus; Negation of a number

a number of

een aantal,een paar

atomic number

NUMBER OF PROTONS FOUND IN THE NUCLEUS OF AN ATOM

Atom number; Atomic numbers; Atomic Number; Proton number; Z (Atomic number); Z (atomic number); Number of protons; Nuclear charge number

Atomisch cijfer (het aantal protonen in de atoomkern)

mass number

NUMBER OF HEAVY PARTICLES IN THE ATOMIC NUCLEUS

Nucleon number; Mass Number; Atomic mass number; Atomic Mass Number; Nuclear number; A = Z + N

massanummer (geheel van protonen en neutronen in atoomkern)

Определение

a number of

several.

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Википедия

Additive inverse

In mathematics, the additive inverse of a number a is the number that, when added to a, yields zero. This number is also known as the opposite (number), sign change, and negation. For a real number, it reverses its sign: the additive inverse (opposite number) of a positive number is negative, and the additive inverse of a negative number is positive. Zero is the additive inverse of itself.

The additive inverse of a is denoted by unary minus: −a (see also § Relation to subtraction below). For example, the additive inverse of 7 is −7, because 7 + (−7) = 0, and the additive inverse of −0.3 is 0.3, because −0.3 + 0.3 = 0.

Similarly, the additive inverse of a − b is −(a − b) which can be simplified to b − a. The additive inverse of 2x − 3 is 3 − 2x, because 2x − 3 + 3 − 2x = 0.

The additive inverse is defined as its inverse element under the binary operation of addition (see also § Formal definition below), which allows a broad generalization to mathematical objects other than numbers. As for any inverse operation, double additive inverse has no net effect: −(−x) = x.

https://en.wikipedia.org/wiki/Additive inverse

Примеры употребления для a number of

1. President, a number of questioners –– sorry –– a number of people have asked...

2. "DNA matches with the defendant were found on a number of places on a number of devices," Mr Kerr said.

3. The show featured a number of interesting characters, representing a number of very different extremes in society.

4. "I‘ve had a number of conversations with a number of people who are interested," he said yesterday.

5. "They understand that there have been a number of UK casualties and a number of UK fatalities," the spokesman said.