∫0∞ⅇ-x⁢t⁢q⁡t⁢ln⁡t⁢ⅆ⁡t∼∑s=0∞Γ′⁡s+λμ⁢asxs+λ/μ-ln⁡x⁢∑s=0∞Γ⁡s+λμ⁢asxs+λ/μ,