Operators on weights

`*` [multiply](weight.multiply.ipynb) Product (concatenation)
`&` [conjunction](weight.conjunction.ipynb) Conjunction (synchronized product)
`+` [sum](weight.sum.ipynb) Sum (disjunction)
`%` [difference](weight.difference.ipynb) Difference
`-` [difference](weight.difference.ipynb) Difference
`**` [power](weight.power.ipynb) Repeated concatenation