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References to 'approximate identity'
1. $C^*$-algebras have approximate identities by asteroid
2. $L^1(G)$ has an approximate identity by asteroid
3. closed ideals in $C^*$-algebras are self-adjoint by asteroid
4. discrete time Fourier transform in relation with continuous time Fourier transform by fernsanz
5. Gelfand-Naimark theorem by mhale
6. Gelfand-Naimark-Segal construction by asteroid
7. proof of quotients in $C^*$-algebras by asteroid