What I'm Learning in CSC 226
(Discrete Mathematics)

(08.29.03)  The Three Dollar Rule

Given:  a v b
c -> a
c

Prove:  $3 v a

Statement
Reason
1.  a v b
Given
2.  c -> a
Given
3.  c
Given
4.  -c v a
2, Implication
5.  a
3, 4; Modus Ponens
6.  $3
3 Dollar Rule
7.  $3 v a
6, 5; Conjunction

See the 3 Dollar Rule in Action!

1.  [Insert Statement Here]
2. [Insert Another Statement Here]
3. [Insert Another Statement Here]

1 and 2 are your STORE.  Three is $3 in actuality.  That's the Three Dollar Rule.

Thm.  In any proof above 3 steps, you may use the Three Dollar Rule alone.

See how much I'm learning!

Back to Everyday Life