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introductory_examples.rst -> fix some stuff in algebra ex13

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docs/introductory_examples.rst
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@ -385,8 +385,6 @@ edge that needs a complex profile.
:start-after: [Ex. 12]
:end-before: [Ex. 12]
The star ``*`` operator is again used to unpack the list.
.. _ex 13:
@ -423,12 +421,13 @@ Counter-sink and counter-bore holes are useful for creating recessed areas for f
------------------------------------------------------------
build123d includes a feature for finding the position along a line segment. This
is normalized between 0 and 1 and can be accessed using the :meth:`~topology.Mixin1D.position_at` operator.
Similarly the :meth:`~topology.Mixin1D.tangent_at` operator returns the line direction at a given point.
is normalized between 0 and 1 and can be accessed using the :meth:`~topology.Mixin1D.position_at` (`@`) operator.
Similarly the :meth:`~topology.Mixin1D.tangent_at` (`%`) operator returns the line direction at a given point.
These two features are very powerful for chaining line segments together without
having to repeat dimensions again and again, which is error prone, time
consuming, and more difficult to maintain.
consuming, and more difficult to maintain. The pending faces must lie on the
path, please see example 37 for a way to make this placement easier.
.. image:: assets/general_ex14.svg
@ -438,8 +437,7 @@ consuming, and more difficult to maintain.
The :meth:`~operations_generic.sweep` method takes any pending faces and sweeps them through the provided
path (in this case the path is taken from the pending edges from ``ex14_ln``).
:meth:`~operations_part.revolve` requires a single connected wire. The pending faces must lie on the
path.
:meth:`~operations_part.revolve` requires a single connected wire.
.. literalinclude:: general_examples.py
:start-after: [Ex. 14]
@ -448,13 +446,13 @@ consuming, and more difficult to maintain.
* **Algebra mode**
The :meth:`~operations_generic.sweep` method takes any faces and sweeps them through the provided
path (in this case the path is taken from the pending edges from ``ex14_ln``).
path (in this case the path is taken from ``ex14_ln``).
.. literalinclude:: general_examples_algebra.py
:start-after: [Ex. 14]
:end-before: [Ex. 14]
It is also possible to use :class:`~geometry.Vector` addition (and other vector math operations)
It is also possible to use tuple or :class:`~geometry.Vector` addition (and other vector math operations)
as seen in the ``l3`` variable.
.. _ex 15: