def testDDStructureDelta(self):
# Construct type DD structures, and test whether d^2 = 0 holds.
# PMC on both sides are genus 1 split PMC.
pmc = splitPMC(1)
# Strand algebra corresponding to pmc.
alg = pmc.getAlgebra()
# Initialize type DD structure over field F_2, with (left-left) action
# by the genus 1 strand algebra. Intend to make this type DD bimodule
# for identity.
ddstr1 = SimpleDDStructure(F2, alg, alg)
# Initialize the list of generators to add to ddstr1.
# The generators have "complementary" idempotents. However, since the
# PMCs are in opposite direction on both sides, the vector specifying
# idempotents are the same.
idems = {"x" : ([0], [0]),
"y" : ([1], [1])}
gens = {}
for name, (idem1, idem2) in idems.items():
gens[name] = SimpleDDGenerator(
ddstr1, Idempotent(pmc, idem1), Idempotent(pmc, idem2), name)
ddstr1.addGenerator(gens[name])
# Now add delta
ddstr1.addDelta(gens["x"], gens["y"],
pmc.sd([(0, 1)]), pmc.sd([(2, 3)]), 1)
ddstr1.addDelta(gens["y"], gens["x"],
pmc.sd([(1, 2)]), pmc.sd([(1, 2)]), 1)
ddstr1.addDelta(gens["x"], gens["y"],
pmc.sd([(2, 3)]), pmc.sd([(0, 1)]), 1)
# This already satisfies d^2 = 0
self.assertTrue(ddstr1.testDelta())
# However, one more arrow to finish the bimodule
ddstr1.addDelta(gens["x"], gens["y"],
pmc.sd([(0, 3)]), pmc.sd([(0, 3)]), 1)
# This is now the identity bimodule, of course satisfying d^2 = 0.
self.assertTrue(ddstr1.testDelta())
# Second example, showing failure of testDelta()
ddstr2 = SimpleDDStructure(F2, alg, alg)
# Add the same generators as before
gens = {}
for name, (idem1, idem2) in idems.items():
gens[name] = SimpleDDGenerator(
ddstr2, Idempotent(pmc, idem1), Idempotent(pmc, idem2), name)
ddstr2.addGenerator(gens[name])
# Now add delta
ddstr2.addDelta(gens["x"], gens["y"],
pmc.sd([(0, 1)]), pmc.sd([(0, 1)]), 1)
ddstr2.addDelta(gens["y"], gens["x"],
pmc.sd([(1, 2)]), pmc.sd([(1, 2)]), 1)
# Prints the type DD structure. Note the code already checks that
# idempotent matches in all added arrows (throws an error if they don't
# match).
print ddstr2
# However, testDelta() fails. Prints a term in d^2(x).
self.assertFalse(ddstr2.testDelta())
def testHochchild(self):
pmc = splitPMC(1)
alg = MinusStrandAlgebra(F2, pmc)
ddstr = SimpleDDStructure(F2, alg, alg)
# Initialize the list of generators to add to ddstr1.
idems = {"x" : ([0], [0]),
"y" : ([1], [1])}
gens = {}
for name, (idem1, idem2) in idems.items():
gens[name] = SimpleDDGenerator(
ddstr, Idempotent(pmc, idem1), Idempotent(pmc, idem2), name)
ddstr.addGenerator(gens[name])
# Now add delta
ddstr.addDelta(gens["x"], gens["y"],
minusSD(pmc, [(0, 1)]), minusSD(pmc, [(2, 3)]), 1)
ddstr.addDelta(gens["y"], gens["x"],
minusSD(pmc, [(1, 2)]), minusSD(pmc, [(1, 2)]), 1)
ddstr.addDelta(gens["x"], gens["y"],
minusSD(pmc, [(2, 3)]), minusSD(pmc, [(0, 1)]), 1)
ddstr.addDelta(gens["y"], gens["x"],
minusSD(pmc, [(3, 0)]), minusSD(pmc, [(3, 0)]), 1)
print ddstr
self.assertTrue(ddstr.testDelta())
dstr = ddstr.toDStructure()
print dstr
self.assertTrue(dstr.testDelta())
hochchild = dstr.morToD(dstr)
print hochchild
hochchild.simplify(find_homology_basis = True)
print len(hochchild)
meaning_len = [len(gen.prev_meaning)
for gen in hochchild.getGenerators()]
for gen in hochchild.getGenerators():
print gen.prev_meaning
def getAdmissibleDDStructure(self):
"""Returns the type DD structure corresponding to the Heegaard diagram
created by a finger move of the beta circle to the right.
"""
alg1 = self.start_pmc.getAlgebra(mult_one = True)
alg2 = alg1
ddstr = SimpleDDStructure(F2, alg1, alg2)
# Add generators for the non-admissible case - that is, those generators
# that do not contain the two intersections created by the finger move.
original_idems = self._getIdems()
for i in range(len(original_idems)):
left_idem, right_idem = original_idems[i]
ddstr.addGenerator(
SimpleDDGenerator(ddstr, left_idem, right_idem, "0_%d" % i))
# Now add the new generators. These just correspond to the complementary
# idempotents with c_pair on the left, repeated twice.
left_idems = [idem for idem in self.start_pmc.getIdempotents()
if self.c_pair in idem]
for i in range(len(left_idems)):
left_idem = left_idems[i]
right_idem = left_idem.opp().comp()
ddstr.addGenerator(
SimpleDDGenerator(ddstr, left_idem, right_idem, "1_%d" % i))
ddstr.addGenerator(
SimpleDDGenerator(ddstr, left_idem, right_idem, "2_%d" % i))
gen_set = []
for i in range(3):
gen_set.append([gen for gen in ddstr.getGenerators()
if gen.name[:1] == "%d" % i])
# Enumerate the non-special chords (those that do not dependent on the
# idempotent. See the functions themselves for the format of all_chords.
if self.is_degenerate:
all_chords = self._getAdmissibleNonSpecialChordsDegenerate()
else:
all_chords = self._getAdmissibleNonSpecialChords()
for i, j in itertools.product(range(3), range(3)):
all_chords[i][j] = [self._StrandsFromChords(chord1, chord2)
for chord1, chord2 in all_chords[i][j]]
# Now we emulate the logic in ddstructure.DDStrFromChords, except we
# distinguish between ''classes'' of generators, by the first character
# of the name of the generator.
for i, j in itertools.product(range(3), range(3)):
for x, y in itertools.product(gen_set[i], gen_set[j]):
for l_chord, r_chord in all_chords[i][j]:
if l_chord.idemCompatible(x.idem1, y.idem1) and \
r_chord.idemCompatible(x.idem2, y.idem2):
ddstr.addDelta(x, y,
StrandDiagram(alg1, x.idem1, l_chord),
StrandDiagram(alg2, x.idem2, r_chord), 1)
# Special handling for these. From class 2 to class 1, add only if the
# c-pair is occupied on the left side (and not on the right).
# Non-degenerate cases only.
sp_chords = []
if not self.is_degenerate:
for x in range(0, self.c1):
for y in range(self.c2+1, self.n):
sp_chords.append(([(x, y)], [(x, self.u), (self.u, y)]))
sp_chords.append(([(x, y)], [(x, self.d), (self.d, y)]))
sp_chords.append(([(x, self.d), (self.u, y)],
[(x, self.d), (self.u, y)]))
sp_chords = [self._StrandsFromChords(chord1, chord2)
for chord1, chord2 in sp_chords]
for x, y in itertools.product(gen_set[2], gen_set[1]):
for l_chord, r_chord in sp_chords:
if self.c_pair in x.idem1 and \
l_chord.idemCompatible(x.idem1, y.idem1) and \
r_chord.idemCompatible(x.idem2, y.idem2):
assert self.c_pair not in x.idem2.opp() and \
self.c_pair in y.idem1 and \
self.c_pair not in y.idem2.opp()
ddstr.addDelta(x, y,
StrandDiagram(alg1, x.idem1, l_chord),
StrandDiagram(alg2, x.idem2, r_chord), 1)
assert ddstr.testDelta()
return ddstr
