i am working on a paper regarding Mortality Modeling. I have the following equation and I can't figure out why the following equation holds. I think the background knowledge is not important, it's normal matrix multiplication and $a$ and $b$ are real numbers. If someone can give me a hint that would be awesome!
Thanks in advance.
Edit: I solved the Matrix Exponential using Wolfram Alpha:
Normal multiplication leads to result. Thanks for the answers in the comment section!