first commit

1 files changed, 11 insertions, 0 deletions

diff --git a/Math/Combinatorics/YoungTableaux.hs b/Math/Combinatorics/YoungTableaux.hs
new file mode 100644
index 0000000..baa11c0
--- /dev/null
+++ b/Math/Combinatorics/YoungTableaux.hs
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+isRowWord' :: Ord a => [a] -> [a] -> [a] -> Bool
+isRowWord' _  ys [] = ys == []
+isRowWord' [] [] zs = isRowWord' [head zs] [] (tail zs)
+isRowWord' xs [] zs = if last xs <= head zs then isRowWord' (xs ++ [head zs]) [] (tail zs) else isRowWord' [] xs zs
+isRowWord' xs ys zs = 
+  if xs == [] || last xs <= head zs
+    then head ys > head zs && (isRowWord' (xs ++ [head zs]) (tail ys) (tail zs))
+    else ys == [] && isRowWord' [] xs zs
+
+isRowWord :: Ord a => [a] -> Bool
+isRowWord = isRowWord' [] []