Incremental. I think the problem is this: you have an input that you want to change a bunch of times

    input = ...;
    input += d1;
    input += d2;
    input += d3;

and you have some output that depends on the input. Whenever the input changes, the output needs to be recomputed, like this

    input = ...;     output = f(input);
    input += d1;     output = f(input);
    input += d2;     output = f(input);
    input += d3;     output = f(input);

The idea here is to, instead of recomputing the output every time from scratch, find a function g that will compute the output-difference from the input-difference

    input = ...;     output = f(input);
    input += d1;     output += g(d1);
    input += d2;     output += g(d2);
    input += d3;     output += g(d3);

And I think if you write f using the combinators from the differential dataflow framework it will be able to find g automatically for you.