[Merged by Bors] - feat(algebra/group_power/basic): add abs_add_eq_add_abs_iff #6593
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riccardobrasca
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adomani
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Co-authored-by: damiano <adomani@gmail.com>
Co-authored-by: damiano <adomani@gmail.com>
adomani
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Co-authored-by: damiano <adomani@gmail.com>
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jcommelin
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@riccardobrasca did you forget to push a commit or accept Johan's suggestions? |
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Canceled. |
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Sorry, you're right! |
Co-authored-by: Johan Commelin <johan@commelin.net>
Co-authored-by: Johan Commelin <johan@commelin.net>
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Mar 9, 2021
I've added
```
lemma abs_add_eq_add_abs_iff {α : Type*} [linear_ordered_add_comm_group α] (a b : α) :
abs (a + b) = abs a + abs b ↔ (0 ≤ a ∧ 0 ≤ b ∨ a ≤ 0 ∧ b ≤ 0)
```
from `lean-liquid`. For some reasons I am not able to use `wlog hle : a ≤ b using [a b, b a]` at the beginning of the proof, Lean says `unknown identifier 'wlog'` and if I try to import `tactic.wlog` I have tons of errors.
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Build failed (retrying...): |
bors bot
pushed a commit
that referenced
this pull request
Mar 9, 2021
I've added
```
lemma abs_add_eq_add_abs_iff {α : Type*} [linear_ordered_add_comm_group α] (a b : α) :
abs (a + b) = abs a + abs b ↔ (0 ≤ a ∧ 0 ≤ b ∨ a ≤ 0 ∧ b ≤ 0)
```
from `lean-liquid`. For some reasons I am not able to use `wlog hle : a ≤ b using [a b, b a]` at the beginning of the proof, Lean says `unknown identifier 'wlog'` and if I try to import `tactic.wlog` I have tons of errors.
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Pull request successfully merged into master. Build succeeded: |
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ocfnash
pushed a commit
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this pull request
Mar 12, 2021
I've added
```
lemma abs_add_eq_add_abs_iff {α : Type*} [linear_ordered_add_comm_group α] (a b : α) :
abs (a + b) = abs a + abs b ↔ (0 ≤ a ∧ 0 ≤ b ∨ a ≤ 0 ∧ b ≤ 0)
```
from `lean-liquid`. For some reasons I am not able to use `wlog hle : a ≤ b using [a b, b a]` at the beginning of the proof, Lean says `unknown identifier 'wlog'` and if I try to import `tactic.wlog` I have tons of errors.
b-mehta
pushed a commit
that referenced
this pull request
Apr 2, 2021
I've added
```
lemma abs_add_eq_add_abs_iff {α : Type*} [linear_ordered_add_comm_group α] (a b : α) :
abs (a + b) = abs a + abs b ↔ (0 ≤ a ∧ 0 ≤ b ∨ a ≤ 0 ∧ b ≤ 0)
```
from `lean-liquid`. For some reasons I am not able to use `wlog hle : a ≤ b using [a b, b a]` at the beginning of the proof, Lean says `unknown identifier 'wlog'` and if I try to import `tactic.wlog` I have tons of errors.
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I've added
from
lean-liquid. For some reasons I am not able to usewlog hle : a ≤ b using [a b, b a]at the beginning of the proof, Lean saysunknown identifier 'wlog'and if I try to importtactic.wlogI have tons of errors.