Open mkoeppe opened 2 years ago
Description changed:
---
+++
@@ -1,2 +1,5 @@
these are the {0,1}- and {+oo,0}-valued functions on the ambient space that indicate set membership
+`indicator_function`s form algebras in which multiplication is the pointwise multiplication; it corresponds to taking intersections.
+
+
Description changed:
---
+++
@@ -1,5 +1,8 @@
these are the {0,1}- and {+oo,0}-valued functions on the ambient space that indicate set membership
-`indicator_function`s form algebras in which multiplication is the pointwise multiplication; it corresponds to taking intersections.
+`indicator_function`s form algebras in which multiplication is the pointwise multiplication; it corresponds to taking intersections. Every indicator function is an idempotent.
+
+The indicator functions of the faces of a `PolyhedralComplex` form a basis. The indicator functions of their relative interiors form another basis - of orthogonal idempotents.
+The algebra is isomorphic to the `MoebiusAlgebra` of the opposite of the face poset.
Description changed:
---
+++
@@ -1,4 +1,4 @@
-these are the {0,1}- and {+oo,0}-valued functions on the ambient space that indicate set membership
+These are the {0,1}- and {+oo,0}-valued functions on the ambient space that indicate set membership. The main focus of this ticket is on `indicator_function`.
`indicator_function`s form algebras in which multiplication is the pointwise multiplication; it corresponds to taking intersections. Every indicator function is an idempotent.
@@ -6,3 +6,6 @@
The algebra is isomorphic to the `MoebiusAlgebra` of the opposite of the face poset.
+`convex_indicator_function`s merely form a cone of functions. We introduce them on this ticket only to clarify the terminology.
+
+
Dependencies: #31748
Changed dependencies from #31748 to #31748, #31881
Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:
9390187 | WIP Sets.Subobjects.ParentMethods.indicator_function |
Commit: 9390187
Branch pushed to git repo; I updated commit sha1. New commits:
beaea83 | ConvexSet_base: Add indicator_function, indicator_functions_monoid |
Description changed:
---
+++
@@ -6,6 +6,6 @@
The algebra is isomorphic to the `MoebiusAlgebra` of the opposite of the face poset.
-`convex_indicator_function`s merely form a cone of functions. We introduce them on this ticket only to clarify the terminology.
+`convex_indicator_function`s merely form a cone of functions. We introduce them on this ticket only to clarify the terminology, and in preparation for a connection to cvxpy (https://www.cvxpy.org/api_reference/cvxpy.transforms.html#cvxpy.transforms.indicator) in #31981
These are the {0,1}- and {+oo,0}-valued functions on the ambient space that indicate set membership. The main focus of this ticket is on
indicator_function
.indicator_function
s form algebras in which multiplication is the pointwise multiplication; it corresponds to taking intersections. Every indicator function is an idempotent.The indicator functions of the faces of a
PolyhedralComplex
form a basis. The indicator functions of their relative interiors form another basis - of orthogonal idempotents. The algebra is isomorphic to theMoebiusAlgebra
of the opposite of the face poset.convex_indicator_function
s merely form a cone of functions. We introduce them on this ticket only to clarify the terminology, and in preparation for a connection to cvxpy (https://www.cvxpy.org/api_reference/cvxpy.transforms.html#cvxpy.transforms.indicator) in #31981Depends on #31748 Depends on #31881
CC: @tscrim @kliem @yuan-zhou
Component: geometry
Branch/Commit: u/mkoeppe/sets_subobjects_parentmethods_indicator_function__convexset_base_indicator_function__convexset_base_convex_indicator_function @
beaea83
Issue created by migration from https://trac.sagemath.org/ticket/32201