Notation of index

Hi,

I'm moving from MySQL to Pg.
MySQL lets me create indices like this:

CREATE TABLE t ( id         INTEGER        NOT NULL, numba      INTEGER         NOT NULL, txt        VARCHAR(100) NOT
NULL,anosanumba INTEGER         NOT NULL , PRIMARY KEY (id), INDEX (numba), UNIQUE (anosanumba)
 
);

PostgreSQL doesn't like the line : INDEX (numba),

Instead I have to use : CREATE INDEX idx_t_numba ON t (numba);
outside the CREATE TABLE statement.
And as far as I understand I do have to give an plain INDEX explicitely 
a name while Pg makes one up for the UNIQUE.

The point is, that I want to use foreign keys and I figure it helped if 
those fk-columns were indexed but PG won't create indices for columns in 
fk-constraints automatically.
Am I right ?

Why can we use INDEX the same way as UNIQUE ?
Perhaps even as in
... numba   INT4    NOT NULL    INDEX
...