@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_fourier_	skos:broader	isac:linear_transform_ .
isac:_dct_	skos:broader	isac:linear_transform_ .
isac:discrete_fourier_	skos:broader	isac:linear_transform_ .