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We give 2 widest Mehler's formulas for the univariate complex Hermite polynomialsH    m  ,  n    ν    , by performing double summations involving the products    u  mH    m  ,  n    ν    (  z  ,   z  ‾   )H    m  ,  n    ν    (  w  ,   w  ‾   )   ‾    and    u  m    v  nH    m  ,  n    ν    (  z  ,   z  ‾   )H    m  ,  nν  ′(  w  ,   w  ‾   )   ‾   . They can be seen as the complex analogues of the classical Mehler's formula for the real Hermite polynomials. The proof of the first one is based on a generating function giving rise to the reproducing kernel of the generalized Bargmann space of level  m . The second Mehler's formula generalizes the one appearing as a particular case of the so‐called Kibble‐Slepian formula. The proofs we present here are direct and more simpler. Moreover, direct applications are given and remarkable identities are derived.

Mehler's formulas for the univariate complex Hermite polynomials and applications