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Yes, you are right. I'm sorry. The weight loss per day slows down over time. I wish I knew math so I could say what that curve is.
Under the assumption that your daily energy expenditure is a constant proportional to your bodyweight, the resulting curve is similar to exponential decay, ~exp(-c*t).
Think radioactive material, except that instead of decaying all the way towards zero atoms, one's weightloss would stop at a bodyweight consistent with an energy expenditure equal to the energy input from the diet.
Note that this is a pretty bold assumption with many caveats.