Is it somehow possible to raise skills higher than level 100 in The Elder Scrolls V Skyrim

Skills can have a higher effective value than 100, by using items or potions with a Fortify ability on them. So a character with 100 Smithing could drink a Blacksmith potion, and for the purposes of weapon improvement for example, it will be calculated with a Smithing of 140.

However there's no way to increase the 'base' skill higher than 100, not even by using skill books when already 100.