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Is a mathematical proof that only uses symbols (i.e., no explanatory text) valid? - Quora
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Why is the symbol for 'therefore' (an upright triangle of three dots) rarely used in normal writing? Why does it not appear on a regular keyboard? - Quora
How many mathematics symbols are there? - Quora
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How to insert the 'therefore' symbol in Windows - Quora
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What is the difference between therefore and consequently? - Quora