PERSON@1 -LRB- -RRB- -LRB- NUMBER@1 March NUMBER@2 NUMBER@3 January NUMBER@4 -RRB- , also known as ORGANIZATION@1 , was an MISC@1 philosopher whose primary achievement was the advancement of a theory he called `` immaterialism '' -LRB- later referred to as `` subjective idealism '' by others -RRB- .

PERSON@1 -LRB- -RRB- -LRB- NUMBER@1 March NUMBER@2 NUMBER@3 January NUMBER@4 -RRB- , also known as ORGANIZATION@1 , was a philosopher . His main philosophical achievement was the advancement of a theory he called `` immaterialism '' -LRB- later referred to as `` subjective idealism '' by others -RRB- .
