string-ci<=?

[procedure] string-ci=? string1 string2

[procedure] string-ci<? string1 string2

[procedure] string-ci<=? string1 string2

[procedure] string-ci>? string1 string2

[procedure] string-ci>=? string1 string2

R5RS

See also string=?.

MzScheme extends these to take one or more strings.