On the section on differentiation of logarithms and exponentials the book shows equations like this(adsbygoogle = window.adsbygoogle || []).push({});

(ln(x+Δ)-lnx)/Δ and it gives values for Δ, I do not understand why there is no variable following the Δ.

if you want to see the exact question I am trying to explain please look at page number 119 in this online version of the book: https://www.amazon.com/Quick-Calcul...qid=1429297938&sr=8-1&keywords=quick+calculus

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# Quick Calculus book uses Δ by itself, ex: (ln(x+Δ)-lnx)/Δ

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