Earlier today, I saw $d$k $f(k)= $ ... in what I believe was a physics integration problem involving spheres. I cannot find the original problem. My question is what $d$k means; it is not part of an integral, as far as I know.
2026-03-26 09:37:04.1774517824
What is $d$**k**?
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If what you are seeing is actually $D_k$ $F(k)$ It could be Euler's notation for differentiation. It means the first derivative in respect to k of the function $F(k)$.