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17. is Nilpotent Matrix example ( Enter your problem )
  1. Definition & Examples
  2. Example-2

2. Example-2





2. is Nilpotent Matrix ?
`[[2,2,3],[1,2,3],[-1,-2,-3]]`


Solution:
A square matrix `A` is called a nilpotent matrix, if `A^m = 0` for some positive integer m.


`A` = 
`2``2``3`
`1``2``3`
`-1``-2``-3`


`A×A`=
`2``2``3`
`1``2``3`
`-1``-2``-3`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`2×2+2×1+3×-1``2×2+2×2+3×-2``2×3+2×3+3×-3`
`1×2+2×1+3×-1``1×2+2×2+3×-2``1×3+2×3+3×-3`
`-1×2-2×1-3×-1``-1×2-2×2-3×-2``-1×3-2×3-3×-3`


=
`4+2-3``4+4-6``6+6-9`
`2+2-3``2+4-6``3+6-9`
`-2-2+3``-2-4+6``-3-6+9`


=
`3``2``3`
`1``0``0`
`-1``0``0`



`(A^2)×A`=
`3``2``3`
`1``0``0`
`-1``0``0`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`3×2+2×1+3×-1``3×2+2×2+3×-2``3×3+2×3+3×-3`
`1×2+0×1+0×-1``1×2+0×2+0×-2``1×3+0×3+0×-3`
`-1×2+0×1+0×-1``-1×2+0×2+0×-2``-1×3+0×3+0×-3`


=
`6+2-3``6+4-6``9+6-9`
`2+0+0``2+0+0``3+0+0`
`-2+0+0``-2+0+0``-3+0+0`


=
`5``4``6`
`2``2``3`
`-2``-2``-3`



`(A^3)×A`=
`5``4``6`
`2``2``3`
`-2``-2``-3`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`5×2+4×1+6×-1``5×2+4×2+6×-2``5×3+4×3+6×-3`
`2×2+2×1+3×-1``2×2+2×2+3×-2``2×3+2×3+3×-3`
`-2×2-2×1-3×-1``-2×2-2×2-3×-2``-2×3-2×3-3×-3`


=
`10+4-6``10+8-12``15+12-18`
`4+2-3``4+4-6``6+6-9`
`-4-2+3``-4-4+6``-6-6+9`


=
`8``6``9`
`3``2``3`
`-3``-2``-3`



`(A^4)×A`=
`8``6``9`
`3``2``3`
`-3``-2``-3`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`8×2+6×1+9×-1``8×2+6×2+9×-2``8×3+6×3+9×-3`
`3×2+2×1+3×-1``3×2+2×2+3×-2``3×3+2×3+3×-3`
`-3×2-2×1-3×-1``-3×2-2×2-3×-2``-3×3-2×3-3×-3`


=
`16+6-9``16+12-18``24+18-27`
`6+2-3``6+4-6``9+6-9`
`-6-2+3``-6-4+6``-9-6+9`


=
`13``10``15`
`5``4``6`
`-5``-4``-6`



`(A^5)×A`=
`13``10``15`
`5``4``6`
`-5``-4``-6`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`13×2+10×1+15×-1``13×2+10×2+15×-2``13×3+10×3+15×-3`
`5×2+4×1+6×-1``5×2+4×2+6×-2``5×3+4×3+6×-3`
`-5×2-4×1-6×-1``-5×2-4×2-6×-2``-5×3-4×3-6×-3`


=
`26+10-15``26+20-30``39+30-45`
`10+4-6``10+8-12``15+12-18`
`-10-4+6``-10-8+12``-15-12+18`


=
`21``16``24`
`8``6``9`
`-8``-6``-9`



`(A^6)×A`=
`21``16``24`
`8``6``9`
`-8``-6``-9`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`21×2+16×1+24×-1``21×2+16×2+24×-2``21×3+16×3+24×-3`
`8×2+6×1+9×-1``8×2+6×2+9×-2``8×3+6×3+9×-3`
`-8×2-6×1-9×-1``-8×2-6×2-9×-2``-8×3-6×3-9×-3`


=
`42+16-24``42+32-48``63+48-72`
`16+6-9``16+12-18``24+18-27`
`-16-6+9``-16-12+18``-24-18+27`


=
`34``26``39`
`13``10``15`
`-13``-10``-15`



`(A^7)×A`=
`34``26``39`
`13``10``15`
`-13``-10``-15`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`34×2+26×1+39×-1``34×2+26×2+39×-2``34×3+26×3+39×-3`
`13×2+10×1+15×-1``13×2+10×2+15×-2``13×3+10×3+15×-3`
`-13×2-10×1-15×-1``-13×2-10×2-15×-2``-13×3-10×3-15×-3`


=
`68+26-39``68+52-78``102+78-117`
`26+10-15``26+20-30``39+30-45`
`-26-10+15``-26-20+30``-39-30+45`


=
`55``42``63`
`21``16``24`
`-21``-16``-24`



`(A^8)×A`=
`55``42``63`
`21``16``24`
`-21``-16``-24`
×
`2``2``3`
`1``2``3`
`-1``-2``-3`


=
`55×2+42×1+63×-1``55×2+42×2+63×-2``55×3+42×3+63×-3`
`21×2+16×1+24×-1``21×2+16×2+24×-2``21×3+16×3+24×-3`
`-21×2-16×1-24×-1``-21×2-16×2-24×-2``-21×3-16×3-24×-3`


=
`110+42-63``110+84-126``165+126-189`
`42+16-24``42+32-48``63+48-72`
`-42-16+24``-42-32+48``-63-48+72`


=
`89``68``102`
`34``26``39`
`-34``-26``-39`



`A` is not a nilpotent matrix






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