Recent content by dvs77

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    Atomic Numbers, Valence and More

    hello can anybody tellme about atomic numbers,valances,n related topics :smile:
    • dvs77
    • Thread
    • Atomic Numbers
    • Replies: 3
    • Forum: Chemistry
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    Transforming a 1st Order PDE into a 2nd Order PDE: A Simple Example

    I mean u get a First order or second order partial differential equation
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    Bessel's Equation Solution Proof

    erwin kreziog advanced engineering mathematics book is very nice
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    Total derivative -> partial derivative

    let x(u,v),and u,v are functions of y then dx/dy=∂x/∂u.∂u/∂y+∂x/∂v.∂v/∂y
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    Solving Diff Eq Homework: Population Problem

    i understand the equations but the theory ...
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    Solving Diff Eq Homework: Population Problem

    i didn't understand what u said
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    Is the Sum of Solutions of Linear Differential Equations Also a Solution?

    d(y1+y2)/dx+P(y1+y2)=(dy1/dx+py1)+(dy2/dx+py2) =q(x)+r(x) since q and r are solutions of those non homogeneous differential equations
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    Solving Diff Eq Homework: Population Problem

    ln(x-10)-lnx=ln(x-10/x); at t=150 ln140/150=150/1000+c
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    Transforming a 1st Order PDE into a 2nd Order PDE: A Simple Example

    form the differential equation for the follwing equation (x^2)/a^2 +(y^2)/b^2+(Z^2)/c^2 =1
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    Solving Diff Eq Homework: Population Problem

    dx/x(x-10)=dt/10000 use partial fractions
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    Solving Diff Eq Homework: Population Problem

    dx/dt=(x^2-10x)/10000 solve this equation u ll get corrct solution
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    Bessel's Equation Solution Proof

    start with power series y=x^m(sigma an x^n)
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