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 7h comment Decomposition of a nonsquare affine matrix The matrix $A$ needs to be invertible. That means that $det A \neq 0$ and $p \neq 0$. If $p = 0$ we had $a = 0$ and $b=0$ and therefore A not invertible. Oct6 awarded Yearling Jan29 revised Recursive Generating function for enumerating leaf labeled binary trees added 2 characters in body Jan22 revised How to define the term closed-form expression? added 584 characters in body Jan22 comment How to define the term closed-form expression? @BillDubuque Thanks for the hint! I searched the archive, but couldn't find any similar question (I marked it as duplicated). The answers and comments there confirmed my suspicion, that it is not always meant to be a really precise term. Anyhow, I'll clarify my question a bit. Jan22 awarded Citizen Patrol Jan22 revised How to define the term closed-form expression? edited tags Jan22 asked How to define the term closed-form expression? Dec30 accepted Deriving recursion from generating function Dec26 answered Deriving recursion from generating function Dec26 awarded Commentator Dec26 answered What's the goal of mathematics? Dec26 asked Deriving recursion from generating function Dec22 revised general triangle angles and lengths added 52 characters in body Dec22 comment general triangle angles and lengths Yes, both is correct. Dec22 answered general triangle angles and lengths Nov14 answered Exciting games and material to motivate children to math Nov14 awarded Supporter Nov14 comment Linear recursion with coefficients depending on n Sorry, you acutally answered my question completly. I had different expectations and didn't want to see that you are right... ;) Nov14 accepted Linear recursion with coefficients depending on n