Countable and uncountable nouns are used in everyday speech and writing, but they can be confusing for language learners due to their different forms and rules. In this reference, you will explore the differences between countable and uncountable nouns, how to ...

Nouns: countable and uncountable

Some abstract nouns can be used uncountably or countably. The uncountable use has a more general meaning. The countable use has a more particular meaning. Nouns of this …

BATTERY definition in American English

2. countable noun. A car battery is a rectangular box containing acid that is found in a car engine. It provides the electricity needed to start the car. ...a car with a dead battery. 3. …

How to prove that $mathbb{Q}$ ( the rationals) is a countable set

Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. I want to prove that $mathbb{Q}$ is ...

Countable Sets and Infinity

We can use a similar method to show that even numbers are countable, as are odd numbers. Rational. Rational numbers (the ratio of two integers such as 12 =0.5, 21 =2, 9910 =9.9, etc) are also countable. A nice way to think of it is this table: It has every positive rational number (eventually).

9.2: Countable Sets

Preview Activity (PageIndex{1}): Introduction to Infinite Sets. In Section 9.1, we defined a finite set to be the empty set or a set (A) such that (A thickapprox mathbb{N}_k) for some natural number (k). We also defined an infinite set to be a set that is not finite, but the question now is, "How do we know if a set is infinite?" One way to …

Prove that the union of countably many countable sets is countable.

Well, the assertion is that, if you have a countable collection of sets which are countable themselves, then the union of all elements in the collection is also countable. To demonstrate this, try writing the set of natural numbers as the union of countably many infinite disjoint subsets of $mathbb{N}$ (and, for that, consider decomposing every …

Countable and Uncountable Nouns: Explanation and Examples

What Are Countable and Uncountable Nouns? A countable noun, like apples and bottles, can be counted. An uncountable noun, like love and oxygen, cannot be counted. …

Countable and Uncountable Nouns in English

Countable nouns refer to individual things and we can use them in singular or plural (e.g. coin/coins). Uncountable nouns refer to things that are a whole or a mass and can''t be …

Is electricity countable or uncountable?

Is battery countable or uncountable? (countable) A battery is a device for storing or keeping electricity. Batteries are used to power flashlights, laptop computers, cell phones, and many other devices. Is answer a countable noun? Senior Member. "Answer" is strongly countable: it is very rare (perhaps impossible) to find ''answer'' as an ...

Countable nouns : a / an, some and any | Learn and Practise …

Countable nouns : a / an, some and any

Uncountable Nouns | Learn English

Uncountable Nouns | Learn English

battery noun

Definition of battery noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. 1 [countable] a device that is placed inside a …

Which Power Tool Batteries Are Interchangeable? A Handy …

Brands, brands, everywhere! But which ones let you swap batteries between tools? DeWalt: Known for its FlexVolt technology, it allows its batteries to be used across a range of tools. Makita: Their LXT range of tools all use the same 18V battery. Bosch: Their Power for All system is pretty self-explanatory. ...

How to prove that the set of rational numbers are countable?

$begingroup$ Two sets have the same cardinality if we can exhibit a bijection between them, i.e., a map that is one-to-one on the elements. Any set that can be put in one-to-one correspondence in this way with the natural numbers is called countable. In some sense, this means there is a way to label each element of the set with a distinct natural number, …

battery

battery (countable and uncountable, plural batteries) (countable, electronics) A device used to power electric devices, consisting of a set of electrically connected electrochemical or, archaically, electrostatic cells. A single such cell when used by itself. 1749 ...

battery noun

1 [countable] a device that is placed inside a car engine, clock, radio, etc. and that produces the electricity that makes it work to change the batteries a rechargeable battery battery-powered/-operated a car battery The battery is dead (= it is no longer producing.

battery noun

[countable] a device that is placed inside a car engine, clock, radio, etc. and that produces the electricity that makes it work to replace the batteries a rechargeable battery

Countable or Uncountable noun

This is a very common problem for learners of all languages (and I''ve even seen some native-speaker English teachers make big mistakes with this in English lessons!). We like to talk about things being countable, but really it is nouns that are countable (even when the noun may be both countable and uncountable). ...

How to Tell if a Noun is Countable or Uncountable | Examples

How to Tell if a Noun is Countable or Uncountable

battery

Batteries (countable) A battery is a device for storing or keeping electricity. Batteries are used to power flashlights, laptop computers, cell phones, and many other devices. I put a new battery in the flashlight. I threw away the old, dead battery. (countable) (artillery ...

Is the set of all prime numbers countable?

Also, note that the definition of "countable" you give is not universally accepted: many texts (the majority, as far as I''m aware) define countable as "in bijection with some subset of $mathbb{N}$," so that finite sets are countable.

battery

Batteries (countable) A battery is a device for storing or keeping electricity. Batteries are used to power flashlights, laptop computers, cell phones, and many other devices. I put a new battery in the flashlight. I threw away the old, dead battery. (countable) (artillery) A battery is a coordinated group of artillery weapons.

Countable and Uncountable Nouns

As with countable nouns, we have specific words we use with uncountable nouns. For example, "amount" (e.g., "a large amount of sand") instead of "number" and "less" (e.g., "there is less sand here than I thought") instead of "fewer." We can also say "some butter," refer to a certain weight, such as "100g of butter ...

A, some, any – countable and uncountable nouns

A, some, any – countable and uncountable nouns

battery noun

battery. noun. /ˈbæt̮əri/. (pl. batteries) enlarge image. [countable] a device that is placed inside a car engine, clock, radio, etc. and that produces the electricity that makes it work to change the batteries a rechargeable …

battery

battery (countable and uncountable, plural batteries) ( countable, electronics ) A device used to power electric devices, consisting of a set of electrically …

How to prove that the set of rational numbers are countable?

$begingroup$ Two sets have the same cardinality if we can exhibit a bijection between them, i.e., a map that is one-to-one on the elements. Any set that can be put in one-to-one correspondence in this way with the natural numbers is called countable. In some ...

Countable vs Uncountable: "charge" and "payment"

I''ve noticed that the word ''charge'' is marked in the Macmillan Dictionary as both countable and uncountable in the same meaning: charge [COUNTABLE/UNCOUNTABLE] an amount of money that you have to pay, especially when you visit a place or when someone does something for you ...

Algebraic Numbers are Countable

Algebraic Numbers are Countable

Countable set

Countable set

9.2: Countable Sets

Preview Activity (PageIndex{1}): Introduction to Infinite Sets In Section 9.1, we defined a finite set to be the empty set or a set (A) such that (A thickapprox mathbb{N}_k) for some natural number (k). We also defined an infinite set to be a set that is not finite, but the question now is, "How do we know if a set is infinite?"

Countable and Uncountable Nouns in English

Countable Nouns. Most English nouns are countable nouns.This means they can be used in both the singular and the plural. Example: An apple a day keeps the doctor away. Apples are healthy.; We can put numbers and indefinite articles in front of countable nouns. Example: one banknote, two banknote s one coin, two coin s a cake a sister; We cannot …