Proof: Addi Insn 23

Let's prove the following theorem:

if the following are true:

instruction #5 is addi dst=1 src=2 imm=0
the PC at time 23 = 5
value of cell 2 at time 23 = 3

then value of cell 1 at time 24 = 3

Instructions

Memory Cells

Program Counter	Time
0	0

LW Computer Simulator

Proof:

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Given

1	instruction #5 is `addi dst=1 src=2 imm=0`
2	the PC at time 23 = 5
3	value of cell 2 at time 23 = 3

Proof Table

#	Claim	Reason
1	value of cell 1 at time (23 + 1) = (value of cell 2 at time 23) + 0	if instruction #5 is `addi dst=1 src=2 imm=0` and the PC at time 23 = 5, then value of cell 1 at time (23 + 1) = (value of cell 2 at time 23) + 0 (ADDI Instruction Property)
2	23 + 1 = 24	23 + 1 = 24 (Fixed Value Statement)
3	value of cell 1 at time (23 + 1) = value of cell 1 at time 24	if 23 + 1 = 24, then value of cell 1 at time (23 + 1) = value of cell 1 at time 24 (Substitution)
4	value of cell 1 at time 24 = (value of cell 2 at time 23) + 0	if value of cell 1 at time (23 + 1) = value of cell 1 at time 24 and value of cell 1 at time (23 + 1) = (value of cell 2 at time 23) + 0, then value of cell 1 at time 24 = (value of cell 2 at time 23) + 0 (Transitive Property of Equality Variation 2)
5	value of cell 1 at time 24 = 3 + 0	if value of cell 1 at time 24 = (value of cell 2 at time 23) + 0 and value of cell 2 at time 23 = 3, then value of cell 1 at time 24 = 3 + 0 (Term 1 Substitution)
6	3 + 0 = 3	3 + 0 = 3 (Additive Identity)
7	value of cell 1 at time 24 = 3	if value of cell 1 at time 24 = 3 + 0 and 3 + 0 = 3, then value of cell 1 at time 24 = 3 (Transitive Property of Equality)

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