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Evaluate: /\ |[1+a1, a2, a3],[a1, 1+a2,...

Evaluate: ` /_\ |[1+a_1, a_2, a_3],[a_1, 1+a_2, a_3],[a_1, a_2, 1+a_3]| `

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`C_1toC_1+C_2+C+3`
`|{:(1+a_1+a_2+a_3,a_2,a_3),(1+a_1+a_2+a_3,1+a_2,a_3),(1+a_1+a_2+a_3,a_2,1+a_3):}|`
`=(1+a_1+a_2+a_3)|{:(1,a_2,a_3),(1,1+a_2,a_3),(1,a_2,1+a_3):}|`
`R_1toR_1-R_2, R_2toR_2-R_3`
`=(1+a_1+a_2+a_3)|{:(1,-1,0),(1,1,-1),(1,a_2,1+a_3):}|`
Expanding along `C_1`
`=(1+a_1+a_2+a_3)|{:(-1,0),(1,-1):}|`
`=1+a_1+a_2+a_3`
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