Added extension to field to use numbers as first class citizens

kmath-common/src/main/kotlin/scientifik/kmath/operations/Algebra.kt

@@ -101,6 +101,9 @@ interface Field<T> : Ring<T> {
 
     operator fun T.div(b: T): T = divide(this, b)
     operator fun Number.div(b: T) = this * divide(one, b)
+
+    operator fun T.plus(b: Number) = this.plus(b * one)
+    operator fun Number.plus(b: T) = b + this
 }
 
 /**

kmath-common/src/test/kotlin/scientifik/kmath/expressions/FieldExpressionContextTest.kt

@@ -10,7 +10,7 @@ class FieldExpressionContextTest {
         val context = FieldExpressionContext(DoubleField)
         val expression = with(context) {
             val x = variable("x", 2.0)
-            x * x + 2 * x + 1.0 * one
+            x * x + 2 * x + 1.0
         }
         assertEquals(expression("x" to 1.0), 4.0)
         assertEquals(expression(), 9.0)