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tst1:= (b/4)*(a^{i} + a^{j} - a^{j} );
# The Redberry authors claim we cannot do the following:
def testRB():
ex:= K_a (A^{a b} - A^{b a});
rl:= K_c (A^{c d} - A^{d c}) -> F^{d};
substitute(ex, rl)
tst:= F^{b} - @(ex);
assert(tst==0)
testRB()
ex:= C B A D;
order(ex, 'A, B, C, D', anticommuting=True)
ex:= A B C D;
sym(ex, 'A, B, D')
ex:=
def test04():
\diff{#}::PartialDerivative.
obj6:= \diff{g^{\mu \kappa} * \diff{g_{\kappa \nu}}_{\rho}}_{\sigma};
product_rule(_)
tst6:= \diff{g^{\mu \kappa}}_{\sigma} * \diff{g_{\kappa \nu}}_{\rho}
+g^{\mu \kappa} * \diff{g_{\kappa \nu}}_{\rho \sigma} - @(obj6);
collect_terms(_);
test04()
ctest([1,2,3])
ex:=a+b+c+d;
keep_terms(_, [1,2,3])
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