remove a spurrous adding of the same constraint twice

Author: dimpase

src/sage/coding/delsarte_bounds.py

@@ -201,9 +201,8 @@ def _delsarte_LP_building(n, d, d_star, q, isinteger, solver, maxc=0):
           constraint_1: 0 <= x_1 <= 0
           constraint_2: 0 <= x_2 <= 0
           constraint_3: -7 x_0 - 5 x_1 - 3 x_2 - x_3 + x_4 + 3 x_5 + 5 x_6 + 7 x_7 <= 0
-          constraint_4: -7 x_0 - 5 x_1 - 3 x_2 - x_3 + x_4 + 3 x_5 + 5 x_6 + 7 x_7 <= 0
           ...
-          constraint_16: - x_0 + x_1 - x_2 + x_3 - x_4 + x_5 - x_6 + x_7 <= 0
+          constraint_9: - x_0 + x_1 - x_2 + x_3 - x_4 + x_5 - x_6 + x_7 <= 0
         Variables:
           x_0 is a continuous variable (min=0, max=+oo)
           ...
@@ -220,7 +219,6 @@ def _delsarte_LP_building(n, d, d_star, q, isinteger, solver, maxc=0):
     for j in range(1, n + 1):
         rhs = sum([krawtchouk(n, q, j, r, check=False) * A[r]
                    for r in range(n + 1)])
-        p.add_constraint(0 <= rhs)
         if j >= d_star:
             p.add_constraint(0 <= rhs)
         else:  # rhs is proportional to j-th weight of the dual code