replace raw by symbol in algebra

kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MST.kt

@@ -43,7 +43,7 @@ sealed class MST {
 fun <T> NumericAlgebra<T>.evaluate(node: MST): T {
     return when (node) {
         is MST.Numeric -> number(node.value)
-        is MST.Singular -> raw(node.value)
+        is MST.Singular -> symbol(node.value)
         is MST.Unary -> unaryOperation(node.operation, evaluate(node.value))
         is MST.Binary -> when {
             node.left is MST.Numeric && node.right is MST.Numeric -> {

kmath-ast/src/commonMain/kotlin/scientifik/kmath/ast/MSTExpression.kt

@@ -12,7 +12,7 @@ class MSTExpression<T>(val algebra: NumericAlgebra<T>, val mst: MST) : Expressio
      * Substitute algebra raw value
      */
     private inner class InnerAlgebra(val arguments: Map<String, T>) : NumericAlgebra<T> by algebra {
-        override fun raw(value: String): T = arguments[value] ?: super.raw(value)
+        override fun symbol(value: String): T = arguments[value] ?: super.symbol(value)
     }
 
     override fun invoke(arguments: Map<String, T>): T = InnerAlgebra(arguments).evaluate(mst)

kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Algebra.kt

@@ -10,7 +10,10 @@ interface Algebra<T> {
     /**
      * Wrap raw string or variable
      */
-    fun raw(value: String): T = error("Wrapping of '$value' is not supported in $this")
+    fun symbol(value: String): T = error("Wrapping of '$value' is not supported in $this")
+
+    @Deprecated("Symbol is more concise",replaceWith = ReplaceWith("symbol"))
+    fun raw(value: String): T = symbol(value)
 
     /**
      * Dynamic call of unary operation with name [operation] on [arg]

kmath-core/src/commonMain/kotlin/scientifik/kmath/operations/Complex.kt

@@ -51,10 +51,10 @@ object ComplexField : ExtendedField<Complex> {
 
     operator fun Double.times(c: Complex) = Complex(c.re * this, c.im * this)
 
-    override fun raw(value: String): Complex = if (value == "i") {
+    override fun symbol(value: String): Complex = if (value == "i") {
         i
     } else {
-        super.raw(value)
+        super.symbol(value)
     }
 }