Retrieve more information of fundamental groups of plane curves

src/doc/en/reference/curves/index.rst

@@ -13,6 +13,7 @@ Curves
    sage/schemes/curves/constructor
    sage/schemes/curves/curve
    sage/schemes/curves/affine_curve
+   sage/schemes/curves/plane_curve_arrangement
    sage/schemes/curves/projective_curve
    sage/schemes/curves/point
    sage/schemes/curves/closed_point

src/doc/en/reference/discrete_geometry/index.rst

@@ -12,6 +12,7 @@ Hyperplane arrangements
    :maxdepth: 1
 
    sage/geometry/hyperplane_arrangement/arrangement
+   sage/geometry/hyperplane_arrangement/ordered_arrangement
    sage/geometry/hyperplane_arrangement/library
    sage/geometry/hyperplane_arrangement/hyperplane
    sage/geometry/hyperplane_arrangement/affine_subspace

src/sage/geometry/all.py

@@ -16,4 +16,5 @@
 lazy_import('sage.geometry.voronoi_diagram', 'VoronoiDiagram')
 lazy_import('sage.geometry.ribbon_graph', 'RibbonGraph')
 lazy_import('sage.geometry.hyperplane_arrangement.arrangement', 'HyperplaneArrangements')
+lazy_import('sage.geometry.hyperplane_arrangement.ordered_arrangement', 'OrderedHyperplaneArrangements')
 lazy_import('sage.geometry.hyperplane_arrangement.library', 'hyperplane_arrangements')

src/sage/geometry/hyperplane_arrangement/library.py

@@ -156,7 +156,7 @@ def bigraphical(self, G, A=None, K=QQ, names=None):
         for u, v in G.edge_iterator(labels=False, sort_vertices=False):
             i = vertex_to_int[u]
             j = vertex_to_int[v]
-            hyperplanes.append( x[i] - x[j] - A[i][j])
+            hyperplanes.append(x[i] - x[j] - A[i][j])
             hyperplanes.append(-x[i] + x[j] - A[j][i])
         return H(*hyperplanes)
 
@@ -794,7 +794,7 @@ def Shi(self, data, K=QQ, names=None, m=1):
         hyperplanes = []
 
         for a in PR:
-            for const in range(-m+1,m+1):
+            for const in range(-m + 1, m + 1):
                 hyperplanes.append(sum(a[j]*x[j] for j in range(d))-const)
         A = H(*hyperplanes)
         x = polygen(QQ, 'x')