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 Jun 16 awarded Excavator Jun 16 revised Solving a quadratic equation with precision when using floating point variables there are still two different solutions as long as $a \neq 0$! Jun 16 suggested approved edit on Solving a quadratic equation with precision when using floating point variables May 18 comment Decomposition of a nonsquare affine matrix @tagomago the natorual embedding is given by using homogeneous coordinates as used in the answer. That is a nice trick to transform linear functions in n dimensions to affine functions in n+1 dimensions. Apr 25 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. Oct 6 awarded Yearling Jan 29 revised Recursive Generating function for enumerating leaf labeled binary trees added 2 characters in body Jan 22 revised How to define the term closed-form expression? added 584 characters in body Jan 22 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. Jan 22 awarded Citizen Patrol Jan 22 revised How to define the term closed-form expression? edited tags Jan 22 asked How to define the term closed-form expression? Dec 30 accepted Deriving recursion from generating function Dec 26 answered Deriving recursion from generating function Dec 26 awarded Commentator Dec 26 answered What's the goal of mathematics? Dec 26 asked Deriving recursion from generating function Dec 22 revised general triangle angles and lengths added 52 characters in body Dec 22 comment general triangle angles and lengths Yes, both is correct. Dec 22 answered general triangle angles and lengths