petsc-3.14.5 2021-03-03
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# PetscDTAltVWedge

Compute the wedge product of a j-form and a k-form, giving a (j+k) form

### Synopsis

    #include "petscdt.h"
    PetscErrorCode PetscDTAltVWedge(PetscInt N, PetscInt j, PetscInt k, const PetscReal *a, const PetscReal *b, PetscReal *awedgeb)

### Input Arguments

| N | - the dimension of the vector space, N >= 0
| j | - the degree j of the j-form a, 0 <= j <= N
| k | - the degree k of the k-form b, 0 <= k <= N and 0 <= j+k <= N
| a | - a j-form, size [N choose j]
| b | - a k-form, size [N choose k]

### Output Arguments

| awedgeb | - the (j+k)-form a wedge b, size [N choose (j+k)]: (a wedge b)(v_1,...,v_{j+k}) = \sum_{s} sign(s) a(v_{s_1},...,v_{s_j}) b(v_{s_{j+1}},...,v_{s_{j+k}}), where the sum is over permutations s such that s_1 < s_2 < ... < s_j and s_{j+1} < s_{j+2} < ... < s_{j+k}.

### See Also

PetscDTAltV, PetscDTAltVWedgeMatrix(), PetscDTAltVPullback(), PetscDTAltVPullbackMatrix()

### Level

intermediate

### Location

src/dm/dt/interface/dtaltv.c
Index of all DT routines
Table of Contents for all manual pages
Index of all manual pages