char-ci<=?

[procedure] char-ci=? char1 char2 char3 ...

[procedure] char-ci<=? char1 char2 char3 ...

[procedure] char-ci<? char1 char2 char3 ...

[procedure] char-ci>=? char1 char2 char3 ...

[procedure] char-ci>? char1 char2 char3 ...

R6RS, MzScheme

Compares characters by case-folding them first (see char-foldcase). See the notes in char-upcase.

[procedure] char-ci=? char1 char2

[procedure] char-ci<=? char1 char2

[procedure] char-ci<? char1 char2

[procedure] char-ci>=? char1 char2

[procedure] char-ci>? char1 char2

R5RS