Solve struggles to solve equation with variable constraint

I am trying to find {x,y} set satisfying FOC with the constraint:

``0``
``` Here is my code, which does not give anything. Dbuy = 1 - (x/y) - x*Log[y/x]; Dwait = (x/y) - x; revx = D[(Dbuy*x + Dwait*CCC*y), x] revy = D[(Dbuy*x + Dwait*CCC*y), y] revsln=Solve[{revx==0, revy==0},{x,y}] When I use FindRoot function instead of Solve for a fixed value of CCC (between 0 and 1, for example 0.4), it gives me numerical values (0.322, 0.581) if I add {{x,0.01}, {y,0.01}} But I want some form of closed-form solution for 0<=C<=1 What do you guys think? ```
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``` Posted on 21st October 2018Tags constraint, equation, solve, struggles, variableLeave a comment on Solve struggles to solve equation with variable constraint ```
``` Question: What is the best realistic solution to solve climate change? It seems that everyone complains about climate change but nobody offers solutions for it. What do you think is the best way to solve climate change Posted on 21st October 2018Tags change, climate, question, realistic, solution, solveLeave a comment on Question: What is the best realistic solution to solve climate change? How to solve this equation (Helmholtz equation)? [on hold] How can I solve this equation? I think this is an inhomogeneous Helmholtz equation, however, the sign of $$m^2$$ is negative. $$nabla^2delta R(vec{r})-m^2delta R(vec{r})=frac{1}{3f_{RR}}bigg(kappadelta T(vec{r})-f_QBig(delta theta(vec{r})-2delta Q(vec{r})Big)bigg).$$ Would you please help me? Posted on 21st October 2018Tags equation, helmholtz, solveLeave a comment on How to solve this equation (Helmholtz equation)? [on hold] Solve does not work I am trying to find {x,y} set satisfying FOC with the constraint: 0 Here is my code, which does not give anything. Dbuy = 1 - (x/y) - x*Log[y/x]; Dwait = (x/y) - x; revx = D[(Dbuy*x + Dwait*CCC*y), x] revy = D[(Dbuy*x + Dwait*CCC*y), y] revsln=Solve[{revx==0, revy==0},{x,y}] When I use FindRoot function instead of Solve for a fixed value of CCC (between 0 and 1, for example 0.4), it gives me numerical values (0.322, 0.581) which work. But I want some form of closed-form solution for 0<=C<=1 What do you guys think? Posted on 21st October 2018Tags solveLeave a comment on Solve does not work How do I solve this convolution with a dirac delta? I am asked to show $$int_{-infty}^{infty}(t-tau)^2delta(tau)dtau = t^2$$. I proceed by parts: $$int_a^b uv’ = uv|_a^b – int_a^b vu’$$. I let $$v’ = delta(tau)$$ and $$u = (t-tau)^2$$. Then $$v = H(tau), u’ = -2(t-tau)$$ Then $$int_{-infty}^{infty}(t-tau)^2delta(tau)dtau = (t-tau)^2H(tau)|_{-infty}^infty + int_{infty}^infty H(tau)2(t-tau)dtau$$ How am I expected to solve this given the bounds? Wolfram claims the assertion is true – that it equals $$t^2$$. How do I go about showing it formally? Posted on 21st October 2018Tags convolution, delta, dirac, solveLeave a comment on How do I solve this convolution with a dirac delta? How to solve this equation (Helmholtz equation)? How can I solve this equation? I think this is an inhomogeneous Helmholtz equation, however, the sign of $$m^2$$ is negative. $$nabla^2delta R(vec{r})-m^2delta R(vec{r})=frac{1}{3f_{RR}}bigg(kappadelta T(vec{r})-f_QBig(delta theta(vec{r})-2delta Q(vec{r})Big)bigg).$$ Would you please help me? Thanks. Posted on 21st October 2018Tags equation, helmholtz, solveLeave a comment on How to solve this equation (Helmholtz equation)? Solve system of congruences which involves a quadratic term I am studying for an admission exam and I came to this system of congruences $$x^2 equiv 2 text{ mod } 7 hspace{1cm} x equiv 1 text{ mod } 5$$ I know how to solve linear systems, but I don’t know what to do with a quadratic one. Could anyone explain me ho to solve it? Thanks Posted on 21st October 2018Tags congruences, involves, quadratic, solve, system, whichLeave a comment on Solve system of congruences which involves a quadratic term How to solve this equation (maybe Helmholtz equation)? How can I solve this equation? I think this is an inhomogeneous Helmholtz equation, however, the sign of $$m^2$$ is negative. $$nabla^2delta R(vec{r})-m^2delta R(vec{r})=frac{1}{3f_{RR}}(kappadelta T(vec{r})-f_Q(delta theta(vec{r})-2delta Q(vec{r}))).$$ Would you please help me? Thanks. Posted on 21st October 2018Tags equation, helmholtz, maybe, solveLeave a comment on How to solve this equation (maybe Helmholtz equation)? Posts navigation Page 1 Page 2 … Page 45 Next page ```