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How to use the keyboard to type special symbols, such as infinity, intersection and union in mathematics
One way is to use intelligent ABC input method, press the letter "V" on the keyboard to add numbers, and then turn the page to find a lot. For example, infinity +∞ I press the plus sign first, then use V and then use 1 to turn six pages, and then there will be+∝ and ∪ intersection ∪ and the same reason.