首楞嚴義疏注經 3.505

3.505

同異如根中破。空謂空生，有謂根境，非空有謂無因也。

'Identical or different' is as refuted in the section on faculties. 'Empty' means arising from space; 'existent' means faculties and objective realms; 'neither empty nor existent' means without cause.