I

• image
• image of compact set under continuous function
• image of connected set under continuous function
• increasing function
• induction principle
• infimum
• infimum of sequence
• infinite series
• injection
• integers
• integral test for series
• interior and boundary
• interior points
• intermediate value theorem
• intersection
• intersection of closed sets
• intersection of open sets
• inverse image
• inverse image of closed set under continuous function
• inverse image of open set under continuous function
• isolated points
• isolated points and accumulation points