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The Meaning of ∞ in Mathematics and Its Usage
I saw that many friends upstairs answered wrong. ...

+∞ and-∞ are infinity, one is called positive infinity and the other is called negative infinity.

The definition of infinitesimal is infinitely close to 0 but not equal to 0, such as1+∞.

Generally, these symbols will be widely used in universities. In middle schools, you only need to know their meanings, which is infinite.