Integrating Logarithmic Functions: Understanding the Integral of Logy

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SUMMARY

The integral of the logarithmic function log(y) is correctly identified as y*log(y) - y, according to standard calculus principles. The confusion arises from the base of the logarithm; while the derivative of log(y) is indeed 1/(y*ln(a)), where 'a' is the base, the integral remains consistent across bases. In this case, the integral does not require adjustment for base 10, as the integral formula applies universally. Clarification on the notation used in various calculus texts, particularly regarding the designation of log(y) as the natural logarithm, is essential for accurate interpretation.

PREREQUISITES
  • Understanding of integral calculus, specifically integration by parts.
  • Familiarity with logarithmic functions and their properties.
  • Knowledge of the natural logarithm and its notation.
  • Basic differentiation techniques, particularly for logarithmic functions.
NEXT STEPS
  • Study integration by parts in detail using examples from calculus textbooks.
  • Review properties of logarithmic functions, focusing on natural logarithms versus common logarithms.
  • Practice solving integrals involving logarithmic functions to reinforce understanding.
  • Explore the implications of different logarithmic bases on integration and differentiation.
USEFUL FOR

Students studying calculus, educators teaching integral calculus, and anyone seeking to clarify the properties of logarithmic functions in mathematical contexts.

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Homework Statement



\int\int-xlogy dy dx

the only problem i have is finding the integral of logy
i know i have to integrate my parts with u = logy and dv=dy
the book says the the integral of logy is ylogy-y but isn't the derivative of logy equal to 1/ylna where a is the base?
so isn't the integral of logy equal to ylogy-y/ln10 because of the base 10?
can someone clarify this for me?
 
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I know some calculus books (especially the older ones I have looked at) use log(y) to designate the natural logarithm. Are you certain this isn't the case?
 
oooo it is thanks makes a lot more sense now
 

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