Multiplication of one two-site operator and one one-site operator (acting on one of the sites of the former) giving a new two-site operator.
The one-site operator a
is applied first to the physical state.
References syten::IPEPSv2::AOneOp::aux, syten::STensorImpl::STensor::b(), syten::STensorImpl::SBasisId::cprime(), syten::STensorImpl::SBasisId::cunprime(), syten::STensorImpl::SBasis::is_vacuum(), syten::IPEPSv2::AOneOp::loc, syten::IdentityDenseTensorImpl::merge(), syten::IPEPSv2::AOneOp::op, syten::IPEPSv2::AOneOp::phys_inp, syten::IPEPSv2::AOneOp::phys_out, syten::project(), and SYTEN_ASSERT.