After the Yalta there was effort on West to make Polish contribution in WWII smaller.
The facts are different:en.wikipedia.org/wiki/Bomba_(cryptography)
The bomba, or bomba kryptologiczna (Polish for "bomb" or "cryptologic bomb") was a special-purpose machine designed about October 1938 by Polish Cipher Bureau cryptologist Marian Rejewski to break German Enigma-machine ciphers.
Up to July 25, 1939, the Poles had been breaking Enigma messages for over six and a half years without telling their French and British allies.
The cyclometer was a cryptologic device designed, "probably in 1934 or 1935," by Marian Rejewski of the Polish Cipher Bureau's German section (BS-4) to facilitate decryption of German Enigma ciphertexten.wikipedia.org/wiki/Card_catalog_(cryptology)
The card catalog, or "catalog of characteristics," in cryptography, was a system designed by Polish Cipher Bureau mathematician-cryptologist Marian Rejewski, and first completed about 1935 or 1936, to facilitate decrypting German Enigma ciphers
So it was before WWII.
Times has changed and there are results:
Plaque at Bletchley Park, unveiled 2002. English side reads: "This plaque commemorates the work of Marian Rejewski, Jerzy Różycki and Henryk Zygalski, mathematicians of the Polish intelligence service, in first breaking the Enigma code
I knew the story, but didn't know about the monument in Poznań. I hope to see it next summer.
Picture made form different spots
:) Of course there is Różycki on this monument.
When we look on changes in history. British start to admit that Poles were first and it is only becuase of Polish help they were able to work on next enigma versions.
Without Polish mathematicians Aliess would have been beaten durring WWII.
Knoledge about most German plans or operations was very useful. In many battles allies were well prepared because of knowledge of German plans.