There is a symbol $\propto$ to show that two functions are proportionate to each other. Is there a symbol to show two functions differ by a constant? Say $f(x;y) = 2x + y$, I want something that is like $f(x;y) = 2x$ where equal sign is replaced with that symbol ($y$ is given and hence constant).
2026-04-03 00:19:33.1775175573
Symbol of equivalence between two functions except by constant
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