diff --git a/kmath-ast/src/commonMain/kotlin/kscience/kmath/ast/MstAlgebra.kt b/kmath-ast/src/commonMain/kotlin/kscience/kmath/ast/MstAlgebra.kt
index 96703ffb8..970ef3570 100644
--- a/kmath-ast/src/commonMain/kotlin/kscience/kmath/ast/MstAlgebra.kt
+++ b/kmath-ast/src/commonMain/kotlin/kscience/kmath/ast/MstAlgebra.kt
@@ -25,7 +25,9 @@ public object MstSpace : Space<MST>, NumericAlgebra<MST> {
     public override fun number(value: Number): MST.Numeric = MstAlgebra.number(value)
     public override fun symbol(value: String): MST.Symbolic = MstAlgebra.symbol(value)
     public override fun add(a: MST, b: MST): MST.Binary = binaryOperation(SpaceOperations.PLUS_OPERATION)(a, b)
-    public override fun MST.unaryMinus(): MST = unaryOperation(SpaceOperations.MINUS_OPERATION)(this)
+    public override operator fun MST.unaryPlus(): MST = unaryOperation(SpaceOperations.PLUS_OPERATION)(this)
+    public override operator fun MST.unaryMinus(): MST = unaryOperation(SpaceOperations.MINUS_OPERATION)(this)
+    public override operator fun MST.minus(b: MST): MST = binaryOperation(SpaceOperations.MINUS_OPERATION)(this, b)
 
     public override fun multiply(a: MST, k: Number): MST.Binary =
         binaryOperation(RingOperations.TIMES_OPERATION)(a, number(k))
@@ -41,17 +43,19 @@ public object MstSpace : Space<MST>, NumericAlgebra<MST> {
  * [Ring] over [MST] nodes.
  */
 public object MstRing : Ring<MST>, NumericAlgebra<MST> {
-    override val zero: MST.Numeric
+    public override val zero: MST.Numeric
         get() = MstSpace.zero
 
-    override val one: MST.Numeric by lazy { number(1.0) }
+    public override val one: MST.Numeric by lazy { number(1.0) }
 
     public override fun number(value: Number): MST.Numeric = MstSpace.number(value)
     public override fun symbol(value: String): MST.Symbolic = MstSpace.symbol(value)
     public override fun add(a: MST, b: MST): MST.Binary = MstSpace.add(a, b)
     public override fun multiply(a: MST, k: Number): MST.Binary = MstSpace.multiply(a, k)
     public override fun multiply(a: MST, b: MST): MST.Binary = binaryOperation(RingOperations.TIMES_OPERATION)(a, b)
-    public override fun MST.unaryMinus(): MST = MstSpace.unaryOperation(SpaceOperations.MINUS_OPERATION)(this)
+    public override operator fun MST.unaryPlus(): MST = MstSpace { this@unaryPlus }
+    public override operator fun MST.unaryMinus(): MST = MstSpace { -this@unaryMinus }
+    public override operator fun MST.minus(b: MST): MST = MstSpace { this@minus - b }
 
     public override fun binaryOperation(operation: String): (left: MST, right: MST) -> MST.Binary =
         MstSpace.binaryOperation(operation)
@@ -76,7 +80,9 @@ public object MstField : Field<MST> {
     public override fun multiply(a: MST, k: Number): MST.Binary = MstRing.multiply(a, k)
     public override fun multiply(a: MST, b: MST): MST.Binary = MstRing.multiply(a, b)
     public override fun divide(a: MST, b: MST): MST.Binary = binaryOperation(FieldOperations.DIV_OPERATION)(a, b)
-    public override fun MST.unaryMinus(): MST = MstSpace.unaryOperation(SpaceOperations.MINUS_OPERATION)(this)
+    public override operator fun MST.unaryPlus(): MST = MstRing { this@unaryPlus }
+    public override operator fun MST.unaryMinus(): MST = MstRing { -this@unaryMinus }
+    public override operator fun MST.minus(b: MST): MST = MstRing { this@minus - b }
 
     public override fun binaryOperation(operation: String): (left: MST, right: MST) -> MST.Binary =
         MstRing.binaryOperation(operation)
@@ -111,7 +117,9 @@ public object MstExtendedField : ExtendedField<MST> {
     public override fun multiply(a: MST, k: Number): MST.Binary = MstField.multiply(a, k)
     public override fun multiply(a: MST, b: MST): MST.Binary = MstField.multiply(a, b)
     public override fun divide(a: MST, b: MST): MST.Binary = MstField.divide(a, b)
-    public override fun MST.unaryMinus(): MST = MstSpace.unaryOperation(SpaceOperations.MINUS_OPERATION)(this)
+    public override operator fun MST.unaryPlus(): MST = MstField { this@unaryPlus }
+    public override operator fun MST.unaryMinus(): MST = MstField { -this@unaryMinus }
+    public override operator fun MST.minus(b: MST): MST = MstField { this@minus - b }
 
     public override fun power(arg: MST, pow: Number): MST.Binary =
         binaryOperation(PowerOperations.POW_OPERATION)(arg, number(pow))
diff --git a/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt b/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt
index 6cf9eeb78..f1ceb8858 100644
--- a/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt
+++ b/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/Algebra.kt
@@ -275,12 +275,12 @@ public interface SpaceOperations<T> : Algebra<T> {
 
     public companion object {
         /**
-         * The identifier of addition.
+         * The identifier of addition and unary positive.
          */
         public const val PLUS_OPERATION: String = "+"
 
         /**
-         * The identifier of subtraction (and negation).
+         * The identifier of subtraction and unary negation.
          */
         public const val MINUS_OPERATION: String = "-"
     }
diff --git a/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/NumberAlgebra.kt b/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/NumberAlgebra.kt
index cd2bd0417..84d89b7eb 100644
--- a/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/NumberAlgebra.kt
+++ b/kmath-core/src/commonMain/kotlin/kscience/kmath/operations/NumberAlgebra.kt
@@ -1,6 +1,5 @@
 package kscience.kmath.operations
 
-import kotlin.math.abs
 import kotlin.math.pow as kpow
 
 /**
@@ -249,10 +248,10 @@ public object ByteRing : Ring<Byte>, Norm<Byte, Byte> {
 @Suppress("EXTENSION_SHADOWED_BY_MEMBER", "OVERRIDE_BY_INLINE", "NOTHING_TO_INLINE")
 public object LongRing : Ring<Long>, Norm<Long, Long> {
     public override val zero: Long
-        get() = 0
+        get() = 0L
 
     public override val one: Long
-        get() = 1
+        get() = 1L
 
     public override inline fun add(a: Long, b: Long): Long = a + b
     public override inline fun multiply(a: Long, k: Number): Long = a * k.toLong()