Definition 𝑦𝑘+1=𝑦𝑘+Δ𝑡𝑓(𝑡𝑘,𝑦𝑘) when it’s linear, we can say 𝑦𝑘+1=𝑦𝑘+Δ𝑡𝜆𝑦𝑘=𝑦𝑘(1+Δ𝑡𝜆) Stability It’s stable only if all 𝜆: |1+ℎ𝜆𝑖|≤1