def _check_elementary_axis_name(name: str) ->bool:
    """
    Valid elementary axes contain only lower latin letters and digits and start with a letter.
    """
    if len(name) == 0:
        return False
    if not 'a' <= name[0] <= 'z':
        return False
    for letter in name:
        if not letter.isdigit() and not 'a' <= letter <= 'z':
            return False
    return True
