In Section 3.1 of the IOTA Whitepaper it refers to small delta (δ) but does not actually define what it does. Can you help define δ and explain what the equation is trying to tell me?
H(t) represent the expected cumulative weight at time t.
∂ is a way to note a very small delta time.
The first equation explicit the value the H function relatively to the value of the H function a very small time before.
The second equation is the differential of the first one. In other words, dH(t)/dt is the slope of the function H(t)