What does the triangle equals sign mean?

AI Thread Summary
The triangle equals sign (∴) is often used to indicate "is defined as" or "equals by definition." It was referenced in the context of the Lie derivative on Wikipedia. In contrast, the triple-equals sign (≡) denotes that a function identically equals a constant or another function. The two symbols serve different purposes in mathematical notation. Understanding these distinctions is crucial for clarity in mathematical expressions.
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It is sometimes used to mean "is defined as" or equals by definition.
 
Agree with LCKurtz.
 
Gracias, amigos.

does it differ in meaning from the triple-equals sign? \equiv
 
The triple-equals is usually used to denote that a function identically equals some constant number (or another function).
 
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