1 | initial version |

Plots are objects that can be added, so you can first create the plot of your function:

```
sage: F = plot3d(lambda x,y: x^2+y^2, [-2,2], [-2,2])
```

Then the plot of the plane $z=1$

```
sage: P = implicit_plot3d(lambda x,y,z: z-1, (-2,2), (-2,2), (-2,2))
```

Then you can add them on a common plot:

```
sage: F+P
```

2 | No.2 Revision |

Plots are objects that can be added, so you can first create the plot of your function:

```
sage: F = plot3d(lambda x,y: x^2+y^2, [-2,2], [-2,2])
```

Then the plot of the plane ~~$z=1$~~$x=1$

`sage: P = implicit_plot3d(lambda x,y,z: `~~z-1, ~~x-1, (-2,2), (-2,2), (-2,2))

Then you can add them on a common plot:

```
sage: F+P
```

3 | No.3 Revision |

Plots are objects that can be added, so you can first create the plot of your function:

```
sage: F = plot3d(lambda x,y: x^2+y^2, [-2,2], [-2,2])
```

Then the plot of the plane $x=1$

`sage: P = implicit_plot3d(lambda x,y,z: x-1, (-2,2), (-2,2), `~~(-2,2))
~~(-2,8))

Then you can add them on a common plot:

```
sage: F+P
```

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