2.16.9 Problems 801 to 900

Table 2.34: Main lookup table. Sorted sequentially by problem number.







#

ODE

Program classification

CAS classification

Solved?

Verified?

time (sec)








801

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=x_{1}+2 x_{2} \\ x_{2}^{\prime }=-5 x_{1} \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

1.307








802

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=-x_{1} \\ x_{2}^{\prime }=-x_{2} \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

0.416








803

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=2 x_{1}-\frac {5 x_{2}}{2} \\ x_{2}^{\prime }=\frac {9 x_{1}}{5}-x_{2} \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

0.791








804

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=x_{1}+x_{2}-2 \\ x_{2}^{\prime }=x_{1}-x_{2} \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

1.484








805

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=-2 x_{1}+x_{2}-2 \\ x_{2}^{\prime }=x_{1}-2 x_{2}+1 \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

0.953








806

\[ {}\left [\begin {array}{c} x_{1}^{\prime }=-x_{1}-x_{2}-1 \\ x_{2}^{\prime }=2 x_{1}-x_{2}+5 \end {array}\right ] \]

system of linear ODEs

system of linear ODEs

2.035








807

\[ {}\left [\begin {array}{c} x^{\prime }=-x \\ y^{\prime }=-2 y \end {array}\right ] \]

i.c.

system of linear ODEs

system of linear ODEs

0.399








808

\[ {}\left [\begin {array}{c} x^{\prime }=-x \\ y^{\prime }=2 y \end {array}\right ] \]

i.c.

system of linear ODEs

system of linear ODEs

0.363








809

\[ {}\left [\begin {array}{c} x^{\prime }=-x \\ y^{\prime }=2 y \end {array}\right ] \]

i.c.

system of linear ODEs

system of linear ODEs

0.384








810

\[ {}\left [\begin {array}{c} x^{\prime }=-y \\ y^{\prime }=x \end {array}\right ] \]

i.c.

system of linear ODEs

system of linear ODEs

0.486








811

\[ {}\left [\begin {array}{c} x^{\prime }=-y \\ y^{\prime }=x \end {array}\right ] \]

i.c.

system of linear ODEs

system of linear ODEs

0.469








812

\[ {}y^{\prime \prime \prime \prime }+4 y^{\prime \prime \prime }+3 y = t \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _with_linear_symmetries]]

68.273








813

\[ {}t \left (-1+t \right ) y^{\prime \prime \prime \prime }+{\mathrm e}^{t} y^{\prime \prime }+4 y t^{2} = 0 \]

unknown

[[_high_order, _with_linear_symmetries]]

N/A

0.114








814

\[ {}y^{\prime \prime \prime \prime }+y^{\prime \prime } = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.389








815

\[ {}y^{\prime \prime \prime }+2 y^{\prime \prime }-y^{\prime }-2 y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_3rd_order, _missing_x]]

0.319








816

\[ {}x y^{\prime \prime \prime }-y^{\prime \prime } = 0 \]

higher_order_missing_y

[[_3rd_order, _missing_y]]

1.185








817

\[ {}x^{3} y^{\prime \prime \prime }+x^{2} y^{\prime \prime }-2 x y^{\prime }+2 y = 0 \]

higher_order_ODE_non_constant_coefficients_of_type_Euler

[[_3rd_order, _exact, _linear, _homogeneous]]

0.627








818

\[ {}y^{\prime \prime \prime }+2 y^{\prime \prime }-y^{\prime }-3 y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_3rd_order, _missing_x]]

2.604








819

\[ {}t y^{\prime \prime \prime }+2 y^{\prime \prime }-y^{\prime }+t y = 0 \]

unknown

[[_3rd_order, _with_linear_symmetries]]

N/A

0.428








820

\[ {}\left (2-t \right ) y^{\prime \prime \prime }+\left (2 t -3\right ) y^{\prime \prime }-t y^{\prime }+y = 0 \]

unknown

[[_3rd_order, _with_linear_symmetries]]

N/A

0.586








821

\[ {}t^{2} \left (3+t \right ) y^{\prime \prime \prime }-3 t \left (2+t \right ) y^{\prime \prime }+6 \left (t +1\right ) y^{\prime }-6 y = 0 \]

unknown

[[_3rd_order, _with_linear_symmetries]]

N/A

0.665








822

\[ {}y^{\prime \prime \prime }-y^{\prime \prime }-y^{\prime }+y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_3rd_order, _missing_x]]

0.386








823

\[ {}y^{\prime \prime \prime }-3 y^{\prime \prime }+3 y^{\prime }+y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_3rd_order, _missing_x]]

1.038








824

\[ {}y^{\prime \prime \prime \prime }-4 y^{\prime \prime \prime }+4 y^{\prime \prime } = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.421








825

\[ {}y^{\left (6\right )}+y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

4.017








826

\[ {}y^{\left (6\right )}-3 y^{\prime \prime \prime \prime }+3 y^{\prime \prime }-y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.168








827

\[ {}y^{\left (6\right )}-y^{\prime \prime } = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.522








828

\[ {}y^{\left (5\right )}-3 y^{\prime \prime \prime \prime }+3 y^{\prime \prime \prime }-3 y^{\prime \prime }+2 y^{\prime } = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.529








829

\[ {}y^{\left (8\right )}+8 y^{\prime \prime \prime \prime }+16 y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.27








830

\[ {}y^{\prime \prime \prime \prime }+2 y^{\prime \prime }+y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.159








831

\[ {}y^{\prime \prime \prime }+5 y^{\prime \prime }+6 y^{\prime }+2 y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_3rd_order, _missing_x]]

0.424








832

\[ {}y^{\prime \prime \prime \prime }-7 y^{\prime \prime \prime }+6 y^{\prime \prime }+30 y^{\prime }-36 y = 0 \]

higher_order_linear_constant_coefficients_ODE

[[_high_order, _missing_x]]

0.607








833

\[ {}y^{\prime \prime }-y^{\prime }-6 y = 0 \]

i.c.

second_order_laplace

[[_2nd_order, _missing_x]]

0.656








834

\[ {}y^{\prime \prime }+3 y^{\prime }+2 y = 0 \]

i.c.

second_order_laplace

[[_2nd_order, _missing_x]]

0.564








835

\[ {}y^{\prime \prime }-2 y^{\prime }+2 y = 0 \]

i.c.

second_order_laplace

[[_2nd_order, _missing_x]]

0.575








836

\[ {}y^{\prime \prime }-2 y^{\prime }+4 y = 0 \]

i.c.

second_order_laplace

[[_2nd_order, _missing_x]]

0.679








837

\[ {}y^{\prime \prime }+2 y^{\prime }+5 y = 0 \]

i.c.

second_order_laplace

[[_2nd_order, _missing_x]]

0.696








838

\[ {}y^{\prime \prime \prime \prime }-4 y^{\prime \prime \prime }+6 y^{\prime \prime }-4 y^{\prime }+y = 0 \]

i.c.

higher_order_laplace

[[_high_order, _missing_x]]

0.608








839

\[ {}y^{\prime \prime \prime \prime }-4 y = 0 \]

i.c.

higher_order_laplace

[[_high_order, _missing_x]]

1.06








840

\[ {}y^{\prime \prime }+\omega ^{2} y = \cos \left (2 t \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

1.008








841

\[ {}y^{\prime \prime }-2 y^{\prime }+2 y = {\mathrm e}^{-t} \]

i.c.

second_order_laplace

[[_2nd_order, _with_linear_symmetries]]

0.82








842

\[ {}y^{\prime \prime }+4 y = \left \{\begin {array}{cc} 1 & 0\le t <\pi \\ 0 & \pi \le t <\infty \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.557








843

\[ {}y^{\prime \prime }+4 y = \left \{\begin {array}{cc} 1 & 0\le t <1 \\ 0 & 1\le t <\infty \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.522








844

\[ {}y^{\prime \prime }+y = \left \{\begin {array}{cc} t & 0\le t <1 \\ 2-t & 1\le t <2 \\ 0 & 2\le t <\infty \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

3.308








845

\[ {}y^{\prime \prime }+y = \left \{\begin {array}{cc} 1 & 0\le t <3 \pi \\ 0 & 3 \pi \le t <\infty \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

4.123








846

\[ {}y^{\prime \prime }+2 y^{\prime }+2 y = \left \{\begin {array}{cc} 1 & \pi \le t <2 \pi \\ 0 & \operatorname {otherwise} \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

4.998








847

\[ {}y^{\prime \prime }+4 y = \sin \left (t \right )-\operatorname {Heaviside}\left (t -2 \pi \right ) \sin \left (t \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

1.614








848

\[ {}y^{\prime \prime }+3 y^{\prime }+2 y = \left \{\begin {array}{cc} 1 & 0\le t <10 \\ 0 & \operatorname {otherwise} \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

3.308








849

\[ {}y^{\prime \prime }+y^{\prime }+\frac {5 y}{4} = t -\operatorname {Heaviside}\left (t -\frac {\pi }{2}\right ) \left (t -\frac {\pi }{2}\right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

3.156








850

\[ {}y^{\prime \prime }+y^{\prime }+\frac {5 y}{4} = \left \{\begin {array}{cc} \sin \left (t \right ) & 0\le t <\pi \\ 0 & \operatorname {otherwise} \end {array}\right . \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

5.484








851

\[ {}y^{\prime \prime }+4 y = \operatorname {Heaviside}\left (t -\pi \right )-\operatorname {Heaviside}\left (t -3 \pi \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

1.079








852

\[ {}y^{\prime \prime \prime \prime }+5 y^{\prime \prime }+4 y = 1-\operatorname {Heaviside}\left (t -\pi \right ) \]

i.c.

higher_order_laplace

[[_high_order, _linear, _nonhomogeneous]]

6.35








853

\[ {}u^{\prime \prime }+\frac {u^{\prime }}{4}+u = k \left (\operatorname {Heaviside}\left (t -\frac {3}{2}\right )-\operatorname {Heaviside}\left (t -\frac {5}{2}\right )\right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

10.746








854

\[ {}u^{\prime \prime }+\frac {u^{\prime }}{4}+u = \frac {\operatorname {Heaviside}\left (t -\frac {3}{2}\right )}{2}-\frac {\operatorname {Heaviside}\left (t -\frac {5}{2}\right )}{2} \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

5.13








855

\[ {}u^{\prime \prime }+\frac {u^{\prime }}{4}+u = \frac {\operatorname {Heaviside}\left (t -5\right ) \left (t -5\right )-\operatorname {Heaviside}\left (t -5-k \right ) \left (t -5-k \right )}{k} \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

10.247








856

\[ {}y^{\prime \prime }+2 y^{\prime }+2 y = \delta \left (t -\pi \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

1.436








857

\[ {}y^{\prime \prime }+4 y = \delta \left (t -\pi \right )-\delta \left (t -2 \pi \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

0.982








858

\[ {}y^{\prime \prime }+3 y^{\prime }+2 y = \delta \left (t -5\right )+\operatorname {Heaviside}\left (t -10\right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.079








859

\[ {}y^{\prime \prime }+2 y^{\prime }+3 y = \sin \left (t \right )+\delta \left (t -3 \pi \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

4.706








860

\[ {}y^{\prime \prime }+y = \delta \left (t -2 \pi \right ) \cos \left (t \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

0.864








861

\[ {}y^{\prime \prime }+4 y = 2 \delta \left (t -\frac {\pi }{4}\right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

0.983








862

\[ {}y^{\prime \prime }+2 y^{\prime }+2 y = \cos \left (t \right )+\delta \left (t -\frac {\pi }{2}\right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.102








863

\[ {}y^{\prime \prime \prime \prime }-y = \delta \left (-1+t \right ) \]

i.c.

higher_order_laplace

[[_high_order, _linear, _nonhomogeneous]]

3.005








864

\[ {}y^{\prime \prime }+\frac {y^{\prime }}{2}+y = \delta \left (-1+t \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.325








865

\[ {}y^{\prime \prime }+\frac {y^{\prime }}{4}+y = \delta \left (-1+t \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.22








866

\[ {}y^{\prime \prime }+y = \frac {\operatorname {Heaviside}\left (t -4+k \right )-\operatorname {Heaviside}\left (t -4-k \right )}{2 k} \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

2.893








867

\[ {}y^{\prime \prime }+2 y^{\prime }+2 y = f \left (t \right ) \]

i.c.

kovacic, second_order_linear_constant_coeff

[[_2nd_order, _linear, _nonhomogeneous]]

2.126








868

\[ {}y^{\prime \prime }+2 y^{\prime }+2 y = \delta \left (t -\pi \right ) \]

i.c.

second_order_laplace

[[_2nd_order, _linear, _nonhomogeneous]]

0.774








869

\[ {}y^{\prime } = 2 y \]

quadrature

[_quadrature]

0.367








870

\[ {}x y^{\prime }+y = x^{2} \]

exact, linear, differentialType, first_order_ode_lie_symmetry_lookup

[_linear]

1.024








871

\[ {}y^{\prime }+2 x y = x \]

exact, linear, separable, first_order_ode_lie_symmetry_lookup

[_separable]

1.45








872

\[ {}2 y^{\prime }+x \left (y^{2}-1\right ) = 0 \]

exact, riccati, separable, first_order_ode_lie_symmetry_lookup

[_separable]

1.173








873

\[ {}y^{\prime } = x^{2} \left (1+y^{2}\right ) \]

exact, riccati, separable, first_order_ode_lie_symmetry_lookup

[_separable]

0.995








874

\[ {}y^{\prime } = -x \]

quadrature

[_quadrature]

0.141








875

\[ {}y^{\prime } = -x \sin \left (x \right ) \]

quadrature

[_quadrature]

0.446








876

\[ {}y^{\prime } = x \ln \left (x \right ) \]

quadrature

[_quadrature]

0.181








877

\[ {}y^{\prime } = -x \,{\mathrm e}^{x} \]

i.c.

quadrature

[_quadrature]

0.408








878

\[ {}y^{\prime } = x \sin \left (x^{2}\right ) \]

i.c.

quadrature

[_quadrature]

0.98








879

\[ {}y^{\prime } = \tan \left (x \right ) \]

i.c.

quadrature

[_quadrature]

0.562








880

\[ {}y^{\prime } = \cos \left (x \right )-y \tan \left (x \right ) \]

i.c.

linear, exactWithIntegrationFactor, first_order_ode_lie_symmetry_lookup

[_linear]

1.645








881

\[ {}y^{\prime } = \frac {x^{2}-2 x^{2} y+2}{x^{3}} \]

i.c.

linear, exactWithIntegrationFactor, first_order_ode_lie_symmetry_lookup

[_linear]

1.52








882

\[ {}y^{\prime } = x \left (1+y^{2}\right ) \]

i.c.

exact, riccati, separable, first_order_ode_lie_symmetry_lookup

[_separable]

1.637








883

\[ {}y^{\prime } = -\frac {y \left (y+1\right )}{x} \]

i.c.

exact, riccati, bernoulli, separable, first_order_ode_lie_symmetry_lookup

[_separable]

2.308








884

\[ {}y^{\prime } = a y^{\frac {a -1}{a}} \]

quadrature

[_quadrature]

0.303








885

\[ {}y^{\prime } = {| y|}+1 \]

i.c.

quadrature

[_quadrature]

1.563








886

\[ {}y^{\prime } = -1-\frac {x}{2}+\frac {\sqrt {x^{2}+4 x +4 y}}{2} \]

first_order_ode_lie_symmetry_calculated

[[_1st_order, _with_linear_symmetries], _Clairaut]

2.417








887

\[ {}y^{\prime }+a y = 0 \]

quadrature

[_quadrature]

0.499








888

\[ {}y^{\prime }+3 x^{2} y = 0 \]

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.029








889

\[ {}x y^{\prime }+y \ln \left (x \right ) = 0 \]

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.622








890

\[ {}x y^{\prime }+3 y = 0 \]

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.262








891

\[ {}x^{2} y^{\prime }+y = 0 \]

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.134








892

\[ {}y^{\prime }+\frac {\left (1+x \right ) y}{x} = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.648








893

\[ {}x y^{\prime }+\left (1+\frac {1}{\ln \left (x \right )}\right ) y = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

2.164








894

\[ {}x y^{\prime }+\left (1+x \cot \left (x \right )\right ) y = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

2.635








895

\[ {}y^{\prime }-\frac {2 x y}{x^{2}+1} = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.544








896

\[ {}y^{\prime }+\frac {k y}{x} = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

1.545








897

\[ {}y^{\prime }+\tan \left (k x \right ) y = 0 \]

i.c.

exact, linear, separable, homogeneousTypeD2, first_order_ode_lie_symmetry_lookup

[_separable]

2.376








898

\[ {}y^{\prime }+3 y = 1 \]

quadrature

[_quadrature]

0.32








899

\[ {}y^{\prime }+\left (\frac {1}{x}-1\right ) y = -\frac {2}{x} \]

linear, exactWithIntegrationFactor, first_order_ode_lie_symmetry_lookup

[_linear]

1.088








900

\[ {}y^{\prime }+2 x y = x \,{\mathrm e}^{-x^{2}} \]

linear, exactWithIntegrationFactor, first_order_ode_lie_symmetry_lookup

[_linear]

1.0