Gyula Lakos

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20222024

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math.SP2023

Convergence estimates for the Magnus expansion IIA. $2 \times 2$ matrices with operator norm

Gyula Lakos

We review and provide simplified proofs related to the Magnus expansion, and improve convergence estimates. Observations and improvements concerning the Baker--Campbell--Hausdorff…

math.SP2022

A short proof of the elliptical range theorem

Gyula Lakos

A short proof of the elliptical range theorem concerning the numerical range of $2 \times 2$ complex matrices is given.

Convergence estimates for the Magnus expansion IIA. 2×2 matrices with operator norm

A short proof of the elliptical range theorem

Convergence estimates for the Magnus expansion IIA. $2 \times 2$ matrices with operator norm