2021-03-04

## Schur polynomials

Schur functions were first studied by A.-L. Cauchy in [Cau15], where he defined the Schur functions as a ratio of alternants, and proving that these are symmetric. Later, C. Jacobi [Jac41] gave the definition of Schur polynomials via Cauchy's bialternant formula and proved the Jacobi–Trudi identity. The main application of Schur polynomials in representation theory of the symmetric group and $\GL_n$ came much later when I. Schur studied them in his thesis, [Sch01]. A common problem arising in algebraic combinatorics is to show that some symmetric function is Schur-positive. There are several different techniques for this.

The reader is assumed to be familiar with the most basic families of symmetric functions.

A good overview and proofs of the common formulas involving Schur polynomials
can be found in H. Tamvaki's *The theory of Schur polynomials revisited* [Tam12].

See [CKLMSS19] for a study on the complexity of symbolically computing Schur polynomials.

### Weyl formula

Jacobi's definition of Schur polynomials is via Cauchy's bialternant formula, also called Weyl's formula:

\begin{equation*} \schurS_\lambda(x_1,\dotsc,x_n) = \prod_{1\leq i \lt j \leq n} (x_i-x_j)^{-1} \begin{vmatrix} x_1^{\lambda_1+n-1} & x_2^{\lambda_1+n-1} & \dots & x_n^{\lambda_1+n-1} \\ x_1^{\lambda_2+n-2} & x_2^{\lambda_2+n-2} & \dots & x_n^{\lambda_2+n-2} \\ \vdots & \vdots & \ddots & \vdots \\ x_1^{\lambda_n} & x_2^{\lambda_n} & \dots & x_n^{\lambda_n} \end{vmatrix} \end{equation*}This can also be phrased as

\begin{equation*} \schurS_\lambda(x_1,\dotsc,x_n) = \sum_{\sigma \in \symS_n} \sigma\left(\frac{\xvec^\lambda}{\prod_{i \lt j} 1-x_j/x_i } \right) \end{equation*}where $\sigma$ act by permuting the indices of the variables.

### Combinatorial formula

The Schur polynomials may be defined combinatorially as a sum over semi-standard Young tableaux, see [Mac95Sta01]:

\begin{equation*} \schurS_\lambda(\xvec) = \sum_{T \in \SSYT(\lambda)} x^{T} = \sum_{\mu \vdash n} K_{\lambda\mu}\monomial_\mu(\xvec) \end{equation*}The semi-standard Young tableaux of shape $\lambda$ are in bijection with non-intersecting lattice paths, and Gelfand–Tsetlin patterns. The Kostka coefficients, $K_{\lambda\mu},$ are defined as the number of semistandard Young tableaux with weight $\mu.$

**Example.**

The Schur polynomial $\schurS_{32}(x_1,x_2,x_3)$ is given by

\begin{align*} & x_1^3x_2^2 + x_1^3x_3^2 + x_1^3x_2x_3 + x_1^2x_2^3 + x_1^2x_3^3 +\\ & 2x_1^2x_2x_3^2 + 2x_1^2x_2^2x_3 + x_1x_2x_3^3 + 2x_1x_2^2x_3^2 + x_1x_2^3x_3 + \\ & x_2^2x_3^3 + x_2^3x_3^2 \end{align*}The first few monomials arise from the semi-standard Young tableaux below.

$1$ | $1$ | $1$ |

$2$ | $2$ |

$1$ | $1$ | $1$ |

$3$ | $3$ |

$1$ | $1$ | $1$ |

$2$ | $3$ |

$1$ | $1$ | $2$ |

$2$ | $2$ |

$1$ | $1$ | $3$ |

$3$ | $3$ |

$1$ | $1$ | $2$ |

$3$ | $3$ |

$1$ | $1$ | $3$ |

$2$ | $3$ |

### Specializations

We have that

\[ \schurS_{\lambda}(1^m) = \prod_{1\leq i \lt j \leq m} \frac{\lambda_i-\lambda_j + j-i}{j-i} = \prod_{\square \in \lambda} \frac{m + c(\square)}{h(\square)} \]where $h(\square)$ is the hook of the box, and $c(\square)$ is the content. The first identity is a consequence of the Weyl formula, while the second is the hook-content formula [Sta71].

In fact, we have the $q$-analogue

\[ \schurS_{\lambda}(1,q,q^2,\dotsc,q^{m-1}) = q^{n(\lambda)}\prod_{\square \in \lambda} \frac{1-q^{m + c(\square)}}{1-q^{h(\square)}} \]where $n(\lambda) = \sum_{i}(i-1)\lambda_i.$ In particular,

\[ \schurS_{1^n}(1,q,q^2,\dotsc,q^{m-1}) = q^{n(n-1)/2}\qbinom{m}{n}_q \quad \text{and} \quad \schurS_{(n)}(1,q,q^2,\dotsc,q^{m-1}) = \qbinom{m+n-1}{n}_q. \]For history and proof, see [Kra99].

See also the specializations for the skew Schur functions.

### Hall inner product

Let $\langle \cdot, \cdot \rangle$ be the inner product on symmetric functions such that $\langle \powerSum_\lambda, \powerSum_\mu \rangle = \delta_{\lambda\mu}z_\lambda,$ that is, the power-sum functions form an orthogonal basis. Then $\langle \schurS_\lambda, \schurS_\mu \rangle = \delta_{\lambda\mu},$ so that the Schur polynomials is an orthonormal basis. See the preliminaries for the definition of $z_\lambda.$

### Raising operator formula

The Schur polynomials can be defined as

\[ \schurS_\lambda(\xvec) = \prod_{i \lt j} (1-R_{ij}) \completeH_{\lambda}(\xvec) \]where $R_{ij}$ acts on composition indices $\alpha,$ by increasing the $i^\thsup$ part by 1, and decreasing the $j^\thsup$ part by one. The resulting expression can be recognized as a determinant, namely the first Jacobi–Trudi identity.

This usage of raising operators is not entirely formal, but it can be made precise, see [Gar92].

### Jacobi–Trudi identity

The Jacobi-Trudi identitity expresses the Schur polynomial as a determinant of complete homogeneous symmetric functions:

\begin{equation*} \schurS_\lambda(\xvec) = \det[ \completeH_{\lambda_i + j - i}(\xvec) ]_{1\leq i,j \leq n} \end{equation*}By applying the $\omega$-involution, we recover the dual Jacobi–Trudi identity, also known as the Nägelsbach–Kostka identity:

\begin{equation*} \schurS_{\lambda'}(\xvec) = \det[ \elementaryE_{\lambda_i + j - i}(\xvec) ]_{1\leq i,j \leq n} \end{equation*}To prove these identities, one uses the Lindström–Gessel–Viennot lemma on lattice paths, by bijecting semi-standard Young tableaux to sets of non-intersecting lattice paths.

### Giambelli formula

Let $\lambda=(a_1,\dotsc,a_d|b_1,\dotsc,b_d)$ using Frobenius coordinates. The Giambelli formula states that

\[ \schurS_{\lambda}(\xvec) = \det \left( \schurS_{(a_i|b_j)}(\xvec) \right)_{1\leq i,j \leq d}. \]In other words, it expresses an arbitrary Schur function as a determinant of Schur functions indexed by hook shapes. A combinatorial proof of this formula can be found in [ER88].

A similar result expressing Schur functions as determinants of skew Schur functions indexed by border strips, is proved in [LP88]. This is later generalized in the Hamel–Goulden identities.

### Murnaghan–Nakaygama rule

The Murnaghan–Nakayama rule gives a combinatorial rule for computing the coefficients $\chi^{\lambda}_{\mu}$ in the expansion

\begin{equation*} \schurS_\lambda(\xvec) = \sum_{\mu} \frac{\chi^{\lambda}_{\mu}}{z_\mu} \powerSum_{\mu}(\xvec). \end{equation*}See the page on Murnaghan–Nakaygama rule for more details.

### Hanlon's formula

In [Han88], we have the power-sum expansion

\begin{equation*} H_\lambda \schurS_\lambda(\xvec) = \sum_{\substack{\sigma \in RS(\lambda) \\ \tau \in CS(\lambda)}} \sign(\sigma) \powerSum_{\text{type}(\sigma\tau)}(\xvec) \end{equation*}where $RS(\lambda)$ and $CS(\lambda)$ is the row- and column-stabilizers of a fixed standard Young tableau of shape $\lambda.$

It is conjectured that a variant of Hanlon's formula generalize to Jack polynomials.

### Roichman's formula

In [Roi97], the following power-sum symmetric expansion of a Schur polynomial indexed by $\lambda \vdash n$ is given:

\[ \schurS_\lambda(\xvec) = \sum_{\mu \vdash n} % \sum_{\substack{ T \in \SYT(\lambda) \\ \DES(T) \in U_\mu }} % (-1)^{\DES(T) \setminus S_\mu} \frac{\powerSum_\mu(\xvec)}{z_\mu}. \]Here, $U_\mu$ is the set of $\mu$-unimodal subsets of $[n-1],$ see Athanasiadis formula for the definition of $U_\mu$ and $S_\mu.$

A type-$B$ analogue of this result is give in [AAER17].

### Cauchy identities

The Cauchy identity states that

\begin{equation*} \sum_\lambda \schurS_\lambda(\xvec) \schurS_{\lambda}(y) = \sum_\lambda \monomial_\lambda(\xvec) \completeH_{\lambda}(y)= \prod_{i,j} \frac{1}{1-x_i y_j}. \end{equation*}By applying $\omega$ on the $y$-alphabet, we get the second Cauchy identity

\begin{equation*} \sum_\lambda \schurS_\lambda(\xvec) \schurS_{\lambda'}(y) = \sum_\lambda \monomial_\lambda(\xvec) \elementaryE_{\lambda}(y) = \prod_{i,j} (1+x_i y_j). \end{equation*}One can prove these identities bijectively via the Robinson–Schenstedt–Knuth algorithm.

There are other ways to express the Cauchy identity. For example,

\[ \exp\left( \sum_{m\geq 1} m \frac{\powerSum_m(\xvec)}{m} \frac{\powerSum_m(\yvec)}{m} \right) = \sum_{\lambda} \schurS_\lambda(\xvec)\schurS_\lambda(\yvec). \]See [p. 386, Sta01] for a reference.

In [IT07], the following generalization is proved, where the sum is over all partitions with at most $m$ parts.

\begin{equation*} \sum_{\lambda} t^{\lambda_m} \schurS_\lambda(\xvec_m) \schurS_{\lambda}(\yvec_m) = \prod_{1\leq i,j \leq m} \frac{1}{1-x_i y_j} \frac{1 - \prod_{i=1}^m (x_i y_j) }{ 1 - t \prod_{i=1}^m (x_i y_j) } \end{equation*}See also [BW16], where several nice generalizations of the Cauchy identity are proved. Some of these connect to alternating sign matrices.

### Littlewood identities

There are various identities involving a single alphabet,
and are closely related to the theory of *plane partitions*.
Identity two and three below are due to Littlewood.
See [p. 76–77, Mac95] for a reference, or [Exercise 4.3.10, Bre99].

An integer partition is even if all parts are multiples of two.

\begin{equation*} \sum_{\lambda\text{ even}} \schurS_\lambda(\xvec_m) = \prod_{i=1}^m \frac{1}{1-x^2_i} \prod_{1 \leq i \lt j \leq m} \frac{1}{1-x_ix_j} \end{equation*} \begin{equation*} \sum_{\lambda'\text{ even}} \schurS_\lambda(\xvec_m) = \prod_{1 \leq i \lt j \leq m} \frac{1}{1-x_ix_j} \end{equation*}One can prove these via plethysm, see [Sta01]. Further identities are (see [p. 78–79, Mac95])

\begin{equation*} \sum_{\lambda} (-1)^{n(\lambda)}\schurS_\lambda = \prod_{i}\frac{1}{1-x_i} \prod_{ i \lt j} \frac{1}{1+x_ix_j} \end{equation*}and

\begin{equation*} \sum_{\lambda'\text{ even}} (-1)^{|\lambda|/2}\schurS_\lambda = \prod_{ i \lt j} \frac{1}{1+x_ix_j} \end{equation*}### Littlewood–Richardson rule

The Littlewood–Richardson rule is a combinatorial rule for multiplying Schur functions:

\[ \schurS_{\lambda} \cdot \schurS_{\mu} = \sum_{\nu} c^{\nu}_{\lambda\mu} \schurS_{\nu}. \]The coefficients $c^{\nu}_{\lambda\mu}$ are the Littlewood–Richardson coefficients.

There are various combinatorial models for the Littlewood–Richardson coefficients.

From a representation-theoretical point of view, let $V^\lambda$ and $V^\mu$ be two irreducible representations of $\symS_n$ and $\symS_m$ respectively. Consider the restriction of the tensor product $V^\lambda \otimes V^\mu$ to $\symS_{m+n}.$ The multiplicity of the irreducible representation $V^\nu$ in this restriction is given by $c^{\nu}_{\lambda\mu}.$

**Conjecture (See [KTT04]).**

The Littlewood–Richardson coefficients are in correspondence with lattice points in certain rational polytopes, as proved in [BZ88]. It was later proved in [Ras04a], that the function

\[ n \to c^{n \nu}_{n\lambda,n\mu} \]for fixed partitions, is a polynomial in $n.$ In fact, this is the Ehrhart polynomial of the corresponing BZ-polytope (where lattice points are BZ-patterns).

Computer experiments, see [KTT04], suggests that the Ehrhart polynomial above has non-negative coefficients.
This conjecture is still open. A special case of this conjecture is to consider the map $n \to K_{n\lambda,n\mu},$
of so called *stretched Kostka coefficients*.
Various aspects of this problem has been considered in
[Ale16aAle19b].

### Pieri rule

The Pieri formula is a combinatorial rule for multiplying a Schur function with a complete homogeneous symmetric function:

\[ \completeH_k(\xvec) \schurS_{\lambda}(\xvec) = \sum_{\mu} \schurS_{\mu}. \]The sum is taken over all partitions $\mu \vdash |\lambda|+k,$ obtained by adding $k$ boxes to the diagram $\lambda,$ in such a way that two boxes are not allowed to be added to the same column.

By applying the $\omega$-involution, the *dual Pieri rule* is recovered:

where the sum is now over all partitions $\mu$ obtained by adding $k$ boxes to $\lambda$ in such a way that two added boxes may not appear in the same row.

By iterating the Pieri rules, it follows that $\completeH_\lambda(\xvec)$ and $\elementaryE_\lambda(\xvec)$ are Schur-positive. In fact, it is an easy exercise to see that

\[ \completeH_\lambda(\xvec) = \sum_{\mu} K_{\mu \lambda} \schurS_{\mu}, \]where $K_{\mu \lambda}$ are the Kostka coefficients.

One can view the Pieri rules as special cases of the Littlewood–Richardson rule. An analogue of the Pieri rule for Schubert polynomials is given by Monks rule.

### Kronecker Coefficients

The Kronecker coefficients $g_{\lambda\mu\nu}$ can be defined via the relation

\[ \prod_{i,j,k} \frac{1}{1-x_i y_j z_k} = \sum_{\lambda,\mu,\nu} g_{\lambda\mu\nu} \schurS_\lambda(\xvec)\schurS_\mu(\yvec) \schurS_\nu(\zvec). \]They are related to the characters of the symmetric group, see [pp.68–69, Sch01].

\[ g_{\lambda\mu\nu} =\frac{1}{n!} \sum_{\sigma \in \symS_n} \chi^{\lambda}(\sigma)\chi^{\mu}(\sigma)\chi^{\nu}(\sigma). \]They show up as multiplicities in tensor products of irreducible $\symS_n$-modules, and are therefore non-negative.

\[ S^\mu \otimes S^\mu = \bigoplus_\nu \left( S^\nu \right)^{ \oplus g_{\lambda\mu\nu}} \]In plethystic notation,

\[ \schurS_\nu[XY] = \sum_{\lambda,\mu} g_{\lambda\mu\nu} \schurS_\lambda(\xvec) \schurS_\lambda(\yvec). \]The Kronecker coefficients generalize the Littlewood–Richardson coefficients.

**Theorem (Murnaghan).**

Let $|\nu| = |\lambda|+|\mu|$ and $n>|\nu|.$ Then

\[ g( (n,\nu),\; (n+|\lambda|,\mu),\; (n+|\mu|,\lambda) ) = c^{\nu}_{\lambda \mu}. \]**Problem (Murnaghan 1938).**

It is a major open problem to find a combinatorial interpretation for the Kronecker coefficients.

A combinatorial interpretation for $(g_{\lambda\mu\nu})^2$ is discussed in [GR20],
by using *ribbon graphs*.

**Theorem (Bürgisser and Ikenmeyer, [BI08]).**

Computing $g_{\lambda\mu\nu}$ is $\# P$-hard in general.

**Conjecture (Saxl conjecture, 2012).**

Let $\rho$ be the staircase shape $(k-1,k-2,\dotsc,2,1).$ Prove that for all $\nu \vdash \binom{k}{2}$ we have that

\[ g_{\rho, \rho, \nu} \gt 0. \]This conjecture was presented by Jan Saxl at a UCLA talk.

## Skew Schur polynomials

The skew Schur polynomials are defined via the property

\[ \langle \schurS_\mu \schurS_\nu, \schurS_{\lambda} \rangle = \langle \schurS_{\lambda/\mu}, \schurS_\nu \rangle. \]In other words, the skew Schur functions may be defined via the Littlewood–Richardson coefficients:

\[ \schurS_\mu \schurS_\nu = \sum_{\lambda} c^{\lambda}_{\mu \nu} \schurS_\lambda \qquad \Leftrightarrow \qquad \schurS_{\lambda/\mu} = \sum_{\nu} c^{\lambda}_{\mu \nu} \schurS_\nu. \]In [GHO20], the authors characterize which skew Schur polynomials are multiplicity-free. That is, for which $\lambda/\mu,$ the coefficients $c^{\lambda}_{\mu \nu}$ are either 0 or 1. Note that they do this for polynomials (symmetric functions are easier).

### Combinatorial formula

The skew Schur polynomials can be expressed as a sum over skew semi-standard Young tableaux:

\begin{equation*} \schurS_{\lambda/\mu}(\xvec) = \sum_{T \in \SSYT(\lambda/\mu)} \xvec^{T}. \end{equation*}In particular, this shows that the family of skew Schur polynomials contain the usual Schur polynomials and is closed under multiplication. That is, $\schurS_{\lambda^1/\mu^1} \schurS_{\lambda^2/\mu^2}$ can be expressed as $ \schurS_{\lambda^3/\mu^3}$ for the skew shape $\lambda^3/\mu^3$ which is the disjoint union of the two diagrams $\lambda^1/\mu^1$ and $\lambda^2/\mu^2.$

### Specializations

Let $\length(\lambda), \length(\mu) \leq n.$ Then

\[ \schurS_{\lambda/\mu}(1,q,q^2,\dotsc) = \left(\prod_{\square \in \lambda/\mu} [n+c(\square)]_q\right)^{-1} \det\left( \qbinom{\lambda_i+n-i}{\lambda_i-\mu_j-i+j} \right)_{1 \leq i,j \leq n}, \]see [Exer. 102, Sta01] and [CS16].

### Jacobi–Trudi identity

Suppose $\lambda/\mu$ is a skew shape with at most $\ell$ rows. Then

\[ \schurS_{\lambda/\mu} = \det\left[ \completeH_{\lambda_i-\mu_j - i + j} \right]_{1\leq i,j \leq \ell} \text{ and } \schurS_{\lambda'/\mu'} = \det\left[ \elementaryE_{\lambda_i-\mu_j - i + j} \right]_{1\leq i,j \leq \ell}. \]This is proved using the Lindström–Gessel–Viennot lemma.

### Murnaghan–Nakaygama rule

Using the same notation as for the Schur polynomials,

\begin{equation*} \schurS_{\lambda/\mu}(\xvec) = \sum_{\nu} \frac{\powerSum_{\nu}(\xvec)}{z_\nu} \sum_{T \in \BST(\lambda/\mu,\nu)} (-1)^{\mathrm{ht}(T)} \end{equation*}where the sum is taken over border strip tableaux of skew shape $\lambda/\mu$ and weight $\nu.$

### Hamel–Goulden identities

In [HG95], A.M Hamel and I.P Goulden describes a uniform framework, unifying the Jacobi–Trudi identities, the Giambelli formula and the result by A. Lascoux and P. Pragacz [LP88].

Given any *outside decompositon* $(\theta_1,\dotsc,\theta_m)$ of $\lambda/\mu,$
one has

See the reference [HG95] for exact definitions and notation.

### Fundamental quasi-symmetric expansion

Skew Schur polynomials and thus Schur polynomials, expand positively in the Gessel fundamental quasi-symmetric functions,

\[ \schurS_{\lambda/\mu}(\xvec) = \sum_{T \in \SYT(\lambda/\mu)} \gessel_{D(T)}(\xvec) \]where $\SYT(\lambda/\mu)$ is the set of standard Young tableaux of shape $\lambda/\mu$ and $D(T)$ is the descent set of $T.$

The slinky rule can be used to find the Schur expansion of a symmetric function, given the fundamental quasi-symmetric expansion.

### Littlewood-type identities

See [Mac95] for the following identity:

\begin{equation*} \sum_{\lambda} \schurS_{\lambda/\mu} = \prod_{i=1} \frac{1}{1-x_i} \prod_{1 \leq i \lt j \leq m} \frac{1}{1-x_ix_j} \sum_{\nu} \schurS_{\mu/\nu}. \end{equation*}## Various topics

### Gustavsson–Milne formula

Let $\lambda$ be a partition with $k$ parts. Then

\[ \schurS_{\lambda_1 - n + 1, \lambda_2 - n + 2,\dotsc,\lambda_k - n + k}(x_1,\dotsc,x_k) =\sum_{S \in \binom{[n]}{k}} \frac{\schurS_\lambda(x_S)}{\prod_{i\in S} \prod_{j\in \overline{S}}} (x_i-x_j). \]For a proof using words such as Chern classes, tautological bundles and Atiyah–Bott localization theorem, see [Thm. 7.1, FRN12].

This identity is closely related to Widom's formula and stretched Schur polynomials, see [Ale12bAle14].

### Cumulants of Schur polynomials

Maciej Dołęga has introduced the notion of cumulants of families of symmetric functions [Doł19]. Let $\{X_\lambda\}$ be such a family, indexed by partitions. The cumulant is defined as

\[ \kappa( X_{\lambda^1}, \dotsc, X_{\lambda^k} ) \coloneqq \sum_{\pi \in \mathrm{SetPart}([r])} (-1)^{|\pi|-1}(|\pi|-1)! \prod_{ B \in \pi } X_{\lambda^{B_1} \oplus \dotsb \oplus \lambda^{B_\ell}} \]where $\mathrm{SetPart}([r])$ denotes set partitions of $[r],$ $|\pi|$ denotes the number of blocks of $\pi$ and $\oplus$ denotes entrywise addition of the parts of the partitions.

**Problem (M. Dołęga, 2017+).**

Prove that $\kappa( X_{\lambda^1}, \dotsc, X_{\lambda^k} )$ is Schur-positive.

There is a generalization of this to modified Macdonald polynomials.

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