To me, g /: f[g[x_]] := h[x] is just verbose equivalent of f[g[x_]] := h[x]. Can you raise an example that you have to use /:?
What does "upvalue" mean in Mathematica and when to use them?
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To me, g /: f[g[x_]] := h[x] is just verbose equivalent of f[g[x_]] := h[x]. Can you raise an example that you have to use /:?