Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > wbr | Structured version Visualization version GIF version |
Description: Extend wff notation to include the general binary relation predicate. Note that the syntax is simply three class symbols in a row. Since binary relations are the only possible wff expressions consisting of three class expressions in a row, the syntax is unambiguous. (For an example of how syntax could become ambiguous if we are not careful, see the comment in cneg 10227.) |
Ref | Expression |
---|---|
cA | class 𝐴 |
cB | class 𝐵 |
cR | class 𝑅 |
Ref | Expression |
---|---|
wbr | wff 𝐴𝑅𝐵 |
Colors of variables: wff setvar class |
Copyright terms: Public domain | W3C validator |