Reference: Wilson (1988, pp. 131-157)

Definition:

An expression tree is a "tree structure that represents the phrase
structure (meaning) of an algebraic / arithmetic expression." (ibid. p. 231)

- Graph Theory
- Two proofs of "eight plus three equals
eleven"

Note: the expression graph for this proof structure is not a tree. - Two proofs of 1+1=2

Expression trees of structure of these statementsx+sy=s(x+y) 1+sy=s(1+y) x+0=x 1+s0=s(1+0) 1+0=1 1+s0=s1 s0=1 1+1=s1 s1=2 1+1=2

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Created 16/8/99