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diff --git a/hw3/Lorenz.jl b/hw3/Lorenz.jl
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+++ b/hw3/Lorenz.jl
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+using DifferentialEquations
+using Plots
+
+# Simulate Lorenz 63 system and investigate sensitivity to initial conditions
+
+function tendency!(du, u, p, t)
+    x,y,z = u
+    σ,ρ,β = p
+    
+    du[1] = dx = σ*(y-x)
+    du[2] = dy = x*(ρ-z) - y
+    du[3] = dz = x*y - β*z
+end
+
+p = [10.0, 28.0, 8/3] # parameters of the Lorentz 63 system
+tspan = (0.0, 1000.0)
+
+u0 = [1.0, 0.0, 0.0]
+δu0 = [0.0, 0.001, 0.0] # small deviation in initial condition
+
+prob = ODEProblem(tendency!, u0, tspan, p)
+sol1 = solve(prob, Tsit5(), reltol=1e-8, abstol=1e-8) # control simulation
+
+
+prob = ODEProblem(tendency!, u0 + δu0, tspan, p)
+sol2 = solve(prob, Tsit5(), reltol=1e-8, abstol=1e-8) # perturbed initial condition
+
+plot(sol1, idxs = (1, 2, 3)) # 3d plot
+
+# plot(sol1, idxs = (1, 2))
+
+plot([sol1[1, :], sol2[1, :]], [sol1[2, :], sol2[2, :]])
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