A lower bound for the modulus of the Dirichlet eta function on a partition $\mathcal{P}$ from 2-D principal component analysis and transitive composition

The present manuscript aims to derive an expression for the lower bound of the modulus of the Dirichlet eta function on vertical lines $\mathrm{\Re }(s)=\alpha$. The approach employs concepts of two-dimensional principal component analysis built on a parametric ellipse, to match the dimensionality of the complex plane. The one-sided lower bound $\mathrm{\forall }s\in \mathbb{C}$ s.t. $\Re(s) \in $\mathcal{P}$$,$| \eta(s) | \geq \left| 1 - \frac{\sqrt{2}}{2^\alpha} \right|$, where $\eta$ is the Dirichlet eta function, is related with the Riemann hypothesis as $\mathrm{\mid }\eta (s)\mathrm{\mid }>0$ for any $s\in \mathbb{C}$ s.t. $\Re(s) \in $\mathcal{P}$$,where$$\mathcal{P}$$ is a partition spanning one half of the critical strip depending upon a variable. We propose the composite lower bound $\mathrm{\forall }s\in \mathbb{C}$ s.t. $\mathrm{\Re }(s)\in ]1\mathrm{/}2,1[$, $|\eta(s)| \geq $\text{Min}$\left(1- \frac{\sqrt{2}}{2^{\alpha}},\frac{\sqrt{2}}{2^\alpha}-\frac{\sqrt{2}}{2}\right)$, resulting from transitive composition in $\eta(s) = \left(1-\frac{2}{2^s} \right) \zeta(s)$. As a founding principle, the solution space of the set of solutions referring to such ${\mathcal{L}}^2$-problem is a representation of the space spanned by explanatory variables satisfying its algebraic form.