Let R be a ring with identity, and let x = R. Then the equation (-1)x= -x is true in R.

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.1: Definition Of A Ring
Problem 42E: 42. Let . a. Show that is a commutative subring of. b. Find the unity, if one...
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Let R be a ring with identity, and let x = R. Then the equation (-1)x= -x is true in R.
Fill in the white boxes to make a proof of this fact. For each step in the proof, fill in the grey
box to indicate which ring axiom or other fact is used to derive that step.
Proof:
• By
• By
• By
By
• By
●
the multiplicative identity law
the additive identity law
we have
we have
we have
we have
we have (-1)x= -X.
(You should fill all the boxes, so if you came up with a proof that doesn't fill them all, try
including more intermediate steps. Please feel free to look up in the lecture notes what
"Proposition 5.11" is.)
uniqueness of additive inverses
Proposition 5.11
›
"
the distributive law
the additive commutative law
the additive inverse law
(-1+1)x= 0 (-1)x+ 1x=0|| 0((-x) + x) = 0 0x = 0
(-1)(-x) = 1x (-1)x+x=0
Transcribed Image Text:Let R be a ring with identity, and let x = R. Then the equation (-1)x= -x is true in R. Fill in the white boxes to make a proof of this fact. For each step in the proof, fill in the grey box to indicate which ring axiom or other fact is used to derive that step. Proof: • By • By • By By • By ● the multiplicative identity law the additive identity law we have we have we have we have we have (-1)x= -X. (You should fill all the boxes, so if you came up with a proof that doesn't fill them all, try including more intermediate steps. Please feel free to look up in the lecture notes what "Proposition 5.11" is.) uniqueness of additive inverses Proposition 5.11 › " the distributive law the additive commutative law the additive inverse law (-1+1)x= 0 (-1)x+ 1x=0|| 0((-x) + x) = 0 0x = 0 (-1)(-x) = 1x (-1)x+x=0
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