The mathematical expression in the image appears to be quite complex. Here's a breakdown of the different parts:

$-2 + e^{-4\gamma} \prod_{k=1}^{\infty} \frac{e^{\frac{4}{k}} k}{k+4}$

Key components:

1. First term: $-2$

   • This is a constant term.

2. Second term: $e^{-4\gamma}$

   • Here, $\gamma$ could refer to Euler's constant, often denoted by $\gamma \approx 0.5772$.
   • The expression is an exponential function with $-4\gamma$ as the exponent.

3. Infinite product: $\prod_{k=1}^{\infty} \frac{e^{\frac{4}{k}} k}{k+4}$

   • The product starts at $k=1$ and continues to infinity.
   • Each term of the product involves $\frac{e^{\frac{4}{k}} k}{k+4}$, which is a combination of an exponential and a rational function of $k$.

This expression could have applications in number theory, analysis, or combinatorics, particularly with the presence of Euler's constant and the infinite product.

Would you like more details on how to evaluate this product or how the terms are derived?

Here are five related questions to explore further:

1. How is Euler's constant $\gamma$ typically used in infinite series and products?
2. What are some properties of infinite products, especially ones involving exponential functions?
3. How can one evaluate or approximate infinite products like this numerically?
4. How does the behavior of the function $\frac{e^{4/k} k}{k+4}$ impact the convergence of the product?
5. What role does the term $e^{-4\gamma}$ play in the overall behavior of the expression?

Tip: Infinite products often converge when the terms inside decay to 1 rapidly enough, which can be checked by analyzing each factor.