Proof by Deduction (Edexcel A-Level Mathematics): Flashcards

Test if statements are true or not

Deduce true statements from known true statements

Implies that

Right is direct consequence of left

Because $x$ could be $\pm 3$

Double-sided implication

If and only if (iff)

$2n$ where $n$ is an integer

$2n+1$ where $n$ is an integer

Numbers may differ

Even

Odd

Is implied by