We explicitly compute the critical exponents associated with logarithmic corrections (the so-called hatted exponents) starting from the renormalization group equations and the mean field behavior for a wide class of models at the upper critical behavior (for short and long range ϕ^n-theories) and below it. This allows us to check the scaling relations among these critical exponents obtained by analysing the complex singularities (Lee-Yang and Fisher zeroes) of these models. Moreover, we have

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... ained an explicit method to compute the exponent [defined by ξ∼ L ( L)^] and, finally, we have found a new derivation of the scaling law associated with it.