The undefined objects are trees.
P1: There exists at least one tree.
Definition 1. A row is a non-empty collection of trees.
P2: Each tree belongs to at least one row.
P3: Any two distinct tress belong to a unique row.
Definition 2. A given row is called separate from another given row if these two rows have no tree in common.
P4: For each row, there is one and only one row separate from it.
Using only these postulates, prove the following theorems.
Theorem 4. Every row contains at least two trees.
Noodes such that. 1. for each node, there is at most one incoming ..
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