At:
assert term eq
4
3
1.
a: Term
2.
u: Term
Type{i'}
3.
w: a:{v:Term| u(v) }
b:Term. term_eq(a;b) 
a = b
4.
y1: {v:Term| u(v) }
5.
y2: {v:Term| u(v) }
6.
b: Term
7.
u1: TermType{i'}
8.
w1: b:{v:Term| u1(v) }term_eq(tree_node( < y1, y2 > );b) tree_node( < y1, y2 > ) = b 
Term
9.
y3: {v:Term| u1(v) }
10.
y4: {v:Term| u1(v) }
tree_node( < y1, y2 > ) Term
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