I am educated in both mathematics and the Scriptures. Since Caleb answered from a Scriptural perspective I'll just mention a few things about your logic:
Firstly, You're not using precise mathematical language, so it's impossible to determine what you mean from a mathematical or logical standpoint without trying to just infer what you were trying to say. You've said "suffering normalizes to zero", but what I think you meant was that the limit of the suffering function with respect to the time parameter converges to zero.
Second, you've said that "eternal" means to take the limit as the time parameter approaches infinity, but this is a poor approach. God is eternal, but that does not mean he only exists at that limit (only in the infinite future). If Heaven is eternal, then events and properties of Heaven are not functions of time, and so a limit with respect to the time parameter is trivial. Eternal should also mean that properties cannot be written as simple functions, or they cannot be measured, so applying the logic of functions to spiritual things is sure to end in contradiction and confusion. This is why these notions are commonly referred to in philosophy and theology as transcendental or noumenal.
Your logic is anything but clear. In (2) you establish that suffering in Heaven is 0. In (4), you determine that the limit of the suffering function, which by (3) should give the amount of suffering in Heaven, is 0. So you are using your statement in (2) as an argument to establish itself. This is a logical fallacy called begging the question.
Finally, your conclusion does not follow, even if you did establish that suffering goes to zero, because your conclusion is about the meaning of suffering, not the amount of suffering. You have presented a flawed argument that the amount of suffering goes to zero, then have concluded "therefore suffering is meaningless". If you want to demonstrate that, you would need to determine a meaningfulness of suffering function, and show that that function converges to zero. I would argue that any function of "meaningfulness of suffering" must be considered cumulative sense, and as such the limit as the time parameter goes to infinity must have a positive value (the meaning is bounded) or else must be infinite (the meaning is unbounded).
This agrees well with Caleb's answer that suffering does have meaning. In fact, I would say that it is by the suffering of Messiah that all things derive meaning.