Spectral Analysis for $GL_2$

    1. Modular Forms viewed on Groups
    2. Basic Representation Theory
    3. Classification of Unitary Irreducible Representations of $PGL_2(R)$
    4. Spectral Analysis of $PGL_2(Z) \backslash PGL_2(R)$
    5. Global Analysis for Congruence Subgroups
    6. Pre-classification of Admissible Irreducible Representations of $GL_2(Q_p)$
    7. A Talk as Summary and Extension