how can I find out the general solution of Jensen's functional equation?
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Function that is both midpoint convex and concave
83913
Rational solutions of Pell's equation
101776
Bounded solution for an equation
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Solve the functional equation $2f(x)=f(ax)$ for some $a$.
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General solution of expected value of E(f(X))?
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Many other solutions of the Cauchy's Functional Equation
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Find the general solution of $4u_{xx}+5u_{xy}+u_{yy}+u_x+u_y=2$
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Functional Equation simple problem
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Hard functional equation: $ f \big ( x y + f ( x ) \big) = f \big( f ( x ) f ( y ) \big) + x $
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Solution of functional equation $f(x+y)=f(x)+f(y)+y\sqrt{f(x)}$
142725
The general solution of $x^a = a^x$ for real $a >0$
71049
Functional equation $f(xy)=f(x)+f(y)$ and continuity
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Solutions of the Pell-type equation $x^2-2y^2=-1$
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Does the functional equation $f(1/r) = rf(r)$ have any nontrivial solutions besides $f(r) = 1/\sqrt{r}$?
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How to find a fundamental solution to Pell's equation?
100900
Finding maxima and minima of $f(x,y)= x^4 + y^4 - 2x^2 - 2y^2 + 4xy$
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Overview of basic facts about Cauchy functional equation