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Binary Trees

Across
An expression in parentheses that acts as a single operand in a larger expression.
One of the nodes referred to by a node.
A way to traverse a tree, visiting the children of each node before the node itself.
A bottom-most node in a tree, with no children.
An operator that takes two operands.
Nodes that share a common parent.
Down
A way of writing a mathematical expression with each operator appearing before its operands.
The topmost node in a tree, with no parent.
A tree in which each node refers to zero, one, or two dependent nodes.
A way to traverse a tree, visiting each node before its children.
The node that refers to a given node.
The set of nodes equidistant from the root.