IS_A

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The IS_A statement is used to declare a new variable or sub-MODEL in your MODEL. 

x IS_A distance; (* this is an 'atomic' variable: just
    a single numerical value that can be solved for *)
v IS_A vec3; (* vec3 is a sub-model containing x,y,z components *)
v.x = x; (* once variables are declared, you can use them
    in relations involving other variables, possibly from your
    sum-models *)

IS_A can also be used to declare arrays and sets.

See also WILL_BE, IS_REFINED_TO, ALIASES, ARE_THE_SAME.

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