Rake ootcomes

...'f'' o a [[Real nummer|real]] [[variable (mathematics)|variable]] ''x'' an an [[interval (mathematics)|interval]] {{nowrap|<nowiki>[</nowiki>''a'', ''b'' ...'x'' {{=}} ''b''}}, such that aurie abuin the ''x''-axis adds tae the tot, an that ablo the ''x''-axis subtracts frae the tot. Lebesgue integration is aa ...