diff --git a/examples/src/main/kotlin/space/kscience/kmath/series/analyzeDif.kt b/examples/src/main/kotlin/space/kscience/kmath/series/analyzeDif.kt
index d67d59bfc..9b7493438 100644
--- a/examples/src/main/kotlin/space/kscience/kmath/series/analyzeDif.kt
+++ b/examples/src/main/kotlin/space/kscience/kmath/series/analyzeDif.kt
@@ -6,6 +6,7 @@ import kotlinx.html.h1
 import space.kscience.kmath.operations.algebra
 import space.kscience.kmath.operations.bufferAlgebra
 import space.kscience.kmath.structures.Buffer
+import space.kscience.kmath.structures.slice
 import space.kscience.kmath.structures.toList
 import space.kscience.plotly.*
 import kotlin.math.PI
@@ -28,7 +29,7 @@ fun main() = with(Double.algebra.bufferAlgebra.seriesAlgebra()) {
 
 
     val s1 = series(100) { sin(2 * PI * it / 100) + 1.0 }
-    val s2 = s1.slice(20..50).moveTo(40)
+    val s2 = s1.slice(20U..50U).moveTo(40)
 
     val s3: Buffer<Double> = s1.zip(s2) { l, r -> l + r } //s1 + s2
     val s4 = ln(s3)
diff --git a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/BufferView.kt b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/BufferView.kt
index d4e6a4a58..d82efa865 100644
--- a/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/BufferView.kt
+++ b/kmath-core/src/commonMain/kotlin/space/kscience/kmath/structures/BufferView.kt
@@ -137,4 +137,4 @@ public class PermutatedBuffer<T>(
 /**
  * Created a permuted view of given buffer using provided [indices]
  */
-public fun <T> Buffer<T>.view(indices: IntArray): PermutatedBuffer<T> = PermutatedBuffer(this, indices)
\ No newline at end of file
+public fun <T> Buffer<T>.permute(indices: IntArray): PermutatedBuffer<T> = PermutatedBuffer(this, indices)
\ No newline at end of file
diff --git a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/SeriesAlgebra.kt b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/SeriesAlgebra.kt
index ae1bfe0e7..de72c7346 100644
--- a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/SeriesAlgebra.kt
+++ b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/SeriesAlgebra.kt
@@ -14,14 +14,14 @@ internal fun IntRange.intersect(other: IntRange): IntRange =
     max(first, other.first)..min(last, other.last)
 
 @PublishedApi
-internal val IntRange.size
+internal val IntRange.size: Int
     get() = last - first + 1
 
 @PublishedApi
 internal operator fun IntRange.contains(other: IntRange): Boolean = (other.first in this) && (other.last in this)
 
-//TODO add permutated buffer
-//TODO add rank function
+//TODO add permutation sort
+//TODO check rank statistics
 
 
 public interface Series<T> : Buffer<T> {
@@ -90,24 +90,6 @@ public class SeriesAlgebra<T, out A : Ring<T>, out BA : BufferAlgebra<T, A>, L>(
         OffsetBufer(this, index, size)
     }
 
-    /**
-     * Create a buffer view using given absolute range
-     */
-    public fun Buffer<T>.slice(range: IntRange): Series<T> {
-        val size = range.size
-        return if (this is Series) {
-            OffsetBufer(this, indices.first + range.first, size)
-        } else {
-            OffsetBufer(this, range.first, size)
-        }
-    }
-
-    public fun Buffer<T>.expand(range: IntRange, defaultValue: T): Series<T> = if (range in indices) {
-        slice(range)
-    } else {
-        TODO()
-    }
-
     public val Buffer<T>.offset: Int get() = if (this is Series) position else 0
 
     /**