Sumários

Lévy-Itô decomposition

15 Outubro 2025, 14:00 João Guerra

Finite variation functions and finite variation processes. Examples. 

When Lévy processes have finite variation. 
Finite and infinite activity processes. 
Lévy-Itô decomposition. 
The simulation of Lévy processes. 
Simulation of Brownian motion and of Poisson processes. 
The general method of simulation for Lévy processes. 


Poisson random measures and Poisson integrals

14 Outubro 2025, 09:30 João Guerra

Poisson random measures. Definition, properties and examples.

Poisson integrals and compensated Poisson integrals. Definition, properties and examples. 
Discussion of problems related to subordinators and martingales. 


Subordinators. Poisson random measures

8 Outubro 2025, 14:00 João Guerra

Subordinators and its application in time change. Example: Variance-Gamma process. 

Discussion of exercises. 
Poisson random measures. 


Subordinators

7 Outubro 2025, 09:30 João Guerra

Lévy processes: Stable Lévy processes, rotationally invariant stable Lévy processes. 

Subordinator processes: definition and properties. 
Characteristic exponent and Laplace exponent of a subordinator. 
Examples of subordinators: Poisson process, Compound Poisson with jumps of positive size, stable subordinators, Gamma subordinator. 
Subordinators and time change in Lévy processes: example. 


Lévy-Khintchine formula

1 Outubro 2025, 14:00 João Guerra

Lévy-Khintchine formula. 

Characteristic exponent for different distributions. 
Lévy processes characteristic exponent  and Lévy characteristics triplet. Examples: Brownian motion with drift, Poisson process, Compound Poisson process.