Odd Harmonious Labeling of <em>P</em>_n ⊵ <em>C</em>₄and&nbsp; <em>P</em>_n ⊵ <em>D</em>₂(<em>C</em>₄)

A graph  G  with  q  edges is said to be odd harmonious if there exists an injection  f : V ( G ) → ℤ 2q  so that the induced function f *: E ( G )→ {1,3,...,2 q -1} defined by f *( uv )= f ( u )+ f ( v ) is a bijection. Here we show that graphs constructed by edge comb product of path P n and cycle on four vertices C 4 or shadow of cycle of order four D 2 ( C 4 ) are odd harmonious.