Every linguistic sign is located on two axes: the axis of simultaneity and that of succession.
Roman JakobsonThe search for the symbolic value of phonemes, each taken as a whole, runs the risk of giving rise to ambiguous and trivial interpretations because phonemes are complex entities, bundles of different distinctive features.
Roman JakobsonIt is once again the vexing problem of identity within variety; without a solution to this disturbing problem there can be no system, no classification.
Roman Jakobson