[zk/arith_chip] removed pow gate

src/zk/arith_chip.rs

@@ -76,15 +76,6 @@ impl ArithmeticChip {
             vec![s_sub * (lhs - rhs - out)]
         });
 
-        cs.create_gate("pow", |cs| {
-            let lhs = cs.query_advice(a_col, Rotation::cur());
-            let rhs = cs.query_advice(b_col, Rotation::cur());
-            let out = cs.query_advice(a_col, Rotation::next());
-            let s_sub = cs.query_selector(s_sub);
-
-            vec![s_sub * (lhs - rhs - out)]
-        });
-
         ArithmeticChipConfig { a_col, b_col, s_add, s_mul, s_sub }
     }