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Theorem butlast-length
⊦ str ≠ "" → # str.butlast = # str - 1
Type: A user defined theorem
Validity: The proof is valid.
Features: simp, localsimp,
Comment:
Used by:
right-trim-app
,
right-trim-trim
,
Used by units in proved state:
Proof exists?: Yes
View
the proof
Infos about the proof
Proved?: Yes
Interactions: 2
Proof steps: 6
Used lemmas:
butlast-def
,
Used spec theorems:
list-last
/charlist/
lb
Used simplifier rules:
string2list
/
s2l-length
string2list
/
s2l-empty-01
nat
/
add-01
nat-basic2
/
add-base
nat-basic2
/
a
nat-basic2
/
c
string2list
/
l2s-length
string-less
/
len-zero
nat
/
elim-pred-c