# Is $$\lambda$$ a complex number?

Algebra Level 4

Find the smallest positive number $$\lambda$$, such that for any complex numbers $${z_1},{z_2},{z_3} \in \{z\in \mathbb C \big| |z| < 1\}$$, if $$z_1+z_2+z_3 = 0$$, then $$\left|z_1z_2 +z_2z_3+z_3z_1\right|^2+\left|z_1z_2z_3\right|^2 < \lambda$$.

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