The following are the commonly used #202204281446:
| Symbols | Meaning |
|---|---|
| \(\mathbb{R}\) | The set of all real numbers |
| \(\mathbb{Z}\) | The set of all integers |
| \(\mathbb{Q}\) | The set of all rational numbers |
| \(\mathbb{N}\) | The set of all natural numbers |
Sometimes, these symbols could have a superscript such as \(+\), \(-\) and \(\textit{nonneg}\). They indicate a set that has only positive, negative or non-negative elements respectively. For example, \(\mathbb{Z}^-\) means the set of all negative integers.
Note: \(0\) is neither positive nor negative number.