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You're most welcome! :hlop:

x->0 "x стремится к нулю"
y=0 "y обращается в ноль"

PS This is interesting: "к нулю", but "в ноль". Russian fuzzy mathematics...[/quote]
Right, but at least the "в" vs. the "к" is correct. ...

Exactly! You'll say: "x стремится к нулю." :hlop:

Roughly, "в" is closer to "into" and "к" is closer to "towards". So, if you go to a small and specific object, "к" is probably more appropriate because you just move towards the object (you picked a...