Understanding Integrals: Multiplying by a Constant Within the Integral?

  • Thread starter Thread starter Fritz
  • Start date Start date
  • Tags Tags
    Integrals Stupid
AI Thread Summary
When multiplying the left-hand side of an integral by a constant, the right-hand side of the equation must also reflect that constant if it applies to the entire integral. The discussion clarifies that multiplying an integral by a constant does not equate to multiplying the integrand by that constant unless specified. It emphasizes that the relationship between functions and their integrals is not straightforward, particularly in the context of differential equations. The conversation suggests a need for clarity in understanding calculus principles, particularly when dealing with variable versus constant multiplications. Understanding these nuances is essential for mastering integral calculus concepts.
Fritz
Messages
65
Reaction score
0
if you have \int_frac{y}{x}=int_L, if you multiply the LHS by c within the integral, is L multiplied by c within its integral?
 
Mathematics news on Phys.org
Do you mean this?

\int \frac{y}{x} = \int L

- Warren
 
or are you talking about multiplying some constant with an integral ?

- Marlon

c * \int\frac {y}{x} = \int cL ?
 
Not a constant, another variable.
 
If you mean "Is f(x)\int g(x)dx= \int f(x)g(x)dx" the answer is no:
x\int xdx= \frac{1}{2}x^3+ C and \int x^2dx= \frac{1}{3}x^3+ C.

I may be misunderstanding your question since if you are taking differential equations, you certainly should know calculus enough that that would be obvious.
 
Stewart has a first order differential equation section in 2nd semester calculus.
 
Suppose ,instead of the usual x,y coordinate system with an I basis vector along the x -axis and a corresponding j basis vector along the y-axis we instead have a different pair of basis vectors ,call them e and f along their respective axes. I have seen that this is an important subject in maths My question is what physical applications does such a model apply to? I am asking here because I have devoted quite a lot of time in the past to understanding convectors and the dual...
Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. In Dirac’s Principles of Quantum Mechanics published in 1930 he introduced a “convenient notation” he referred to as a “delta function” which he treated as a continuum analog to the discrete Kronecker delta. The Kronecker delta is simply the indexed components of the identity operator in matrix algebra Source: https://www.physicsforums.com/insights/what-exactly-is-diracs-delta-function/ by...
Back
Top