Martin (1992: 116-7):
As far as the nature of the comparison itself is concerned, this may be on the basis of similarity or difference. With general comparison this is the contrast between such, same, equal, similar, identical realising [semblance] and other, different, else realising [difference]. Where the comparison is experientialised, [difference] is realised either through the comparative morpheme -er or through submodification of a two or more syllable adjective with more or less; [semblance] is always realised through submodification in this context:
so/as/such/equally/similarly/identically + adjective.
The following paradigm exemplifies this crossclassification.
QUANTITY QUALITY DIFFERENCE fewer frogs bigger frogs SEMBLANCE as many frogs such big frogs β α β α
 The similarity vs difference opposition is not the basis of all comparative reference, merely the general (vs particular) type. More importantly, Martin misleadingly presents these ideas as if they are his own; see Halliday & Hasan (1976: 76).
 This is a rebranding of the grammatical distinctions in Halliday & Hasan's (1976: 76) ' general comparison' as discourse semantics, with Martin's 'semblance' subsuming the original features 'identity' and 'similarity'.
 Martin's "experientialised" comparison is a rebranding of Halliday & Hasan's (1976: 76) 'particular (non-deictic)' comparison, and Martin's 'quantity' vs 'quality' opposition is a rebranding of their 'numerative' vs 'epithet' opposition, with these grammatical distinctions rebranded as discourse semantics. Most importantly, Martin misleadingly presents these ideas as if they are his own.
the practice of taking someone else's work or ideas and passing them off as one's own.
synonyms: copying, infringement of copyright, piracy, theft, stealing, poaching, appropriation;
See also Jim Martin "Honouring" The Late Ruqaiya Hasan where Martin falsely accused the late Ruqaiya Hasan of plagiarism at a symposium organised to honour her.