leftLcm

**Usage**

leftLcm(A, B)

leftLcm(p, q)

Parameter |
Type |
Description |
---|---|---|

A, B |
Differential operators | |

p, q |
Polynomials |

**Returns**

leftLcm(A, B) returns such that , and every other left multiple of and is a left multiple of , while leftLcm(p, q) returns .

**Example**

An annihilator of can be obtained by computing the least common left multiple of the annihilators and of and respectively:

1 --> L1 := x*D^2 + D; 2 --> L2 := (x+1)*D^2 + D; 3 --> L := leftLcm(L1, L2); 4 --> tex(L);

**See Also**

leftGcd,rightGcd,rightLcm

Manuel Bronstein 2002-09-04