Definition a implicit method 𝑦𝑘+1=𝑦𝑘+ℎ𝑓(𝑡𝑘,𝑦𝑘)+𝑓(𝑡𝑘+1,𝑦𝑘+1)2 Stability It’s sable if |1+ℎ𝜆21−ℎ𝜆2|≤1 for every 𝜆 as Eigenvalue