Exact meaning of weights in SOLR ranking -


i have been trying different weights on solr dismax , edismax ranking , got wonder these weights mean? example, can specify qf parameter this: 

qf:title^2.0 body^1.0 ...

what these weights mean? multiplication of each field's text score? or addition?

also how pf parameter? 

pf:title^2.0 body^0.5

is multiplication or addition?

if shed light, great.

qf -> query fields measures score individual terms. boost multiplies weight individual match score field

e.g. qf:title^2.0 body^1.0 document match on title field have double score document match on boby (given other factors same)

pf -> phrase query measures score phrase terms

e.g. query internet banking , configuration qf:title^2.0 body^1.0 , pf:title^2.0 body^0.5

should result in query :- 

title:internet^2 title:banking^2   body:internet^1 body:banking^1   title:"internet banking"^2 body:"internet banking"^0.5

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