If you want to abbreviate this statement by "x & y" (or whatever symbol you choose), then that's perfectly fine. In particular, when we say "sin(x) ~ x if x 0, there exists d > 0 such that |sin(x) - x| >" and " 100", then that's perfectly fine. The symbol ">" is used in the context of asymptotics and approximation to make statements that there is a precise control on the stated approximation. In fact, the meaning of "> in math is purposely kept vague because in some contexts, it is true that 10 > 1 but false in others. The symbol ">" is sometimes read as "much greater than" but it does not mean "much greater than", at least not how that phrase is (ambiguously) interpreted in English.
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