| A | B |
| conditional statements | "If-then" statements are one type of these. |
| converse | Formed by interchanging the hypothesis & the conclusion of a conditional statement. |
| counterexample | An example which proves a statement is false. |
| hypothesis | The part of a conditional that follows "if". |
| conclusion | The part of a conditional following "then". |
| Euler diagrams | Often called "Venn diagrams" these show the logical relationships between groups. |
| logical chains | Different conditional statements are linked together to form these. |
| adjacent angles | angles in a plane that have vertices & 1 ray in common but no interior points in common |
| biconditional | an "if-and-inly-if"statement |
| valid math definition requirements | TRUE conditional & TRUE converse |