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How to pronounce [2, +∞] in mathematics?
It is read as "closed interval 2 to positive infinity", which means greater than or equal to 2.

+∞ and positive real numbers add, subtract, multiply, divide, multiply and root, and the result is always +∞. In the process of change, the absolute value of a variable is always greater than an arbitrarily large positive number. This variable is called infinity and is represented by the symbol ∞.