Explain example of the wax. and critique what points Descartes is making in his second Meditation with his famous

# Tag: solve

## can you solve q

Explain example of the wax. and critique what points Descartes is making in his second Meditation with his famous

## 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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```

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```
## 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
## 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?

## 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?

```
```

```
```

```
```
## 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?

## 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.

## 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

## 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.

```
```