Summary - Things good to know by heart

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Contribute with things that are necessary to know by heart.

• Stability, solution goes -> 0?
• Residual for step methods: Taylor expand the formula and see what order the RHS is.
• Stability region,$y' = f(y,t)$ 
•  \(Re( h\cdot f(y) ) < 0\) for trapetzoid
• |1+ hf| < 1 for Explicit euler
• |1+ hf| > 1 for implicit euler