FEM for the poisson problem R april14&16,2003￾✂✁☎✄ ✆✞✝✠✟☛✡✌☞✎✍✑✏✒✝✠✓✕✔✖✔✌✝✠✗✘✏✙✟✚✝✜✛✣✢✤✍✦✥ ✓✕✗★✧✪✩✬✫ ✭✣✮✰✯✲✱✴✳✶✵✸✷✒✹✺✵✼✻✾✽ ✫❀✿❁✿❁❂