[請益] 有點像是數學問題
假設
我已經推出 f(x+dx) = f(x) ...............(1)
但這個結果是 我用 dx → 0 取極限得到的
那我可以用(1)式,得到 f(x)和他旁邊一點點相等,旁邊又和旁邊相等....
然後得到“在x上,f處處相等(包括x→∞)”這個結論嗎?
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