Internal problem ID [2435]
Internal file name [OUTPUT/1927_Sunday_June_05_2022_02_39_47_AM_51050310/index.tex]
Book: Elementary Differential Equations, Martin, Reissner, 2nd ed, 1961
Section: Exercis 2, page 5
Problem number: 2(d).
ODE order: 1.
ODE degree: 1.
The type(s) of ODE detected by this program : "quadrature"
Maple gives the following as the ode type
[_quadrature]
\[ \boxed {y^{\prime }={\mathrm e}^{x^{2}}} \]
Integrating both sides gives \begin {align*} y &= \int { {\mathrm e}^{x^{2}}\,\mathop {\mathrm {d}x}}\\ &= \frac {\sqrt {\pi }\, \operatorname {erfi}\left (x \right )}{2}+c_{1} \end {align*}
Summary
The solution(s) found are the following \begin{align*} \tag{1} y &= \frac {\sqrt {\pi }\, \operatorname {erfi}\left (x \right )}{2}+c_{1} \\ \end{align*}
Verification of solutions
\[ y = \frac {\sqrt {\pi }\, \operatorname {erfi}\left (x \right )}{2}+c_{1} \] Verified OK.
\[ \begin {array}{lll} & {} & \textrm {Let's solve}\hspace {3pt} \\ {} & {} & y^{\prime }={\mathrm e}^{x^{2}} \\ \bullet & {} & \textrm {Highest derivative means the order of the ODE is}\hspace {3pt} 1 \\ {} & {} & y^{\prime } \\ \bullet & {} & \textrm {Integrate both sides with respect to}\hspace {3pt} x \\ {} & {} & \int y^{\prime }d x =\int {\mathrm e}^{x^{2}}d x +c_{1} \\ \bullet & {} & \textrm {Evaluate integral}\hspace {3pt} \\ {} & {} & y=\frac {\sqrt {\pi }\, \mathrm {erfi}\left (x \right )}{2}+c_{1} \\ \bullet & {} & \textrm {Solve for}\hspace {3pt} y \\ {} & {} & y=\frac {\sqrt {\pi }\, \mathrm {erfi}\left (x \right )}{2}+c_{1} \end {array} \]
Maple trace
`Methods for first order ODEs: --- Trying classification methods --- trying a quadrature <- quadrature successful`
✓ Solution by Maple
Time used: 0.0 (sec). Leaf size: 13
dsolve(diff(y(x),x)=exp(x^2),y(x), singsol=all)
\[ y \left (x \right ) = \frac {\sqrt {\pi }\, \operatorname {erfi}\left (x \right )}{2}+c_{1} \]
✓ Solution by Mathematica
Time used: 0.014 (sec). Leaf size: 19
DSolve[y'[x]==Exp[x^2],y[x],x,IncludeSingularSolutions -> True]
\[ y(x)\to \frac {1}{2} \sqrt {\pi } \text {erfi}(x)+c_1 \]