The mathematical symbol for unchanged is often represented by the equals sign "=", indicating that two values or expressions are equivalent. In some contexts, particularly in calculus or physics, the symbol for unchanged can also be represented by the notation "∂" (partial derivative) when indicating that a variable remains constant with respect to another variable. However, the most common representation remains the equals sign.
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What mathematical symbol? Different symbols were invented in different times and places.
"why" is not a mathematical symbol.
It's a mathematical metaphor.
z
The symbol is f, for frequency.