def renameDummyIndex(exp):
'renames all Dummy indecis in the expression, in a clever way'
tl=lists.makeTermList(exp)
ttl=lists.makeTensorTermList(tl)
lists.sortTensorTermList(ttl)
renameDummyIndex_TensorTermList(ttl)
return lists.rebuildAdd(ttl,tl)
def tensorSimplify(exp, **kw):
'''
Tyres to simplify a tensor expresion by writing it on a normal form
If you do not like the result you can try simplifying by had using
e.g subsIndex, contractDeltas, renameDummyIndex, epsAsDeltas, allEpsAsDeltas
'''
termList = delta.contractDeltas_termList(
lists.makeTermList(
sympy.expand(
eps.epsAsDeltas(exp,**kw) ) ),
**kw)
ttl = lists.makeTensorTermList(termList)
lists.sortTensorTermList(ttl)
renameDummyIndex_TensorTermList(ttl)
return lists.rebuildAdd(ttl, termList)
