The relationship between a node in a parse tree and its sibling nodes (usually meaning the children of the first branching node that dominates the node) and all the sibling nodes' children.
In syntax, c-command is a relationship between nodes in constituency-based parse trees. Originally defined by Tanya Reinhart, It is analogous to "siblings and all their descendants" in family trees. C-command is closely associated with the phrase structure grammars of the Chomskyan tradition. It is not valid for or applicable to the tree structures of other theories of syntax. For instance, c-command as it is commonly understood can hardly be applied to the dependency-based structures of dependency grammars.
The numerical value of c-command in Chaldean Numerology is: 4
The numerical value of c-command in Pythagorean Numerology is: 3
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