In logical argument and mathematical proof, the therefore sign, written as three dots arranged in an upright triangle, is generally placed before a logical consequence, such as the conclusion of a syllogism, and is read aloud as therefore. It is not common in formal published writing but sees regular use in mathematics and in shorthand note-taking as a compact way to mark that a statement follows from what precedes it.
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1. Therefore Sign (Wikipedia)
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In logical argument and mathematical proof, the therefore sign, ∴, is generally used before a logical consequence, such as the conclusion of a syllogism.
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