Difference between small delta t, big delta t, and dt?

by physicsjn
Tags: delta, difference
 Math Emeritus Sci Advisor Thanks PF Gold P: 39,348 Yes, "$\Delta x$" is the change in f for specific changes in the variables f depends on. "df" is the differential as defined in Calculus. It is, strictly speaking, not an "infinitesal" (which, outside of some very deep logical texts) is at best a loose concept). "$\delta x$" may have a number of different meanings and should be defined in the text.