change the length of block history to check

BEPs/BEP-341.md

@@ -80,7 +80,7 @@ Each epoch will choose a new validator set, assuming an epoch contains epochSlot
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 #### 4.2.3 Block Avoidance
-To prevent fewer than 1/2 of the nodes from controlling the entire network, block producers are required to produce fewer than n blocks within the previous validatorN/2\*n historical blocks.
+To prevent fewer than 1/2 of the nodes from controlling the entire network, block producers are required to produce fewer than n blocks within the previous ((validatorN/2+1)\*n-1) historical blocks.
 
 #### 4.2.4 Governable Number of Consecutive Blocks
 When n=1, it is equivalent to disabling the feature of consecutive block production, while significant optimization is observed when n belongs to the range [3,5]. Currently, the range for the value of n is set to [1,9] but except 2.
@@ -107,7 +107,7 @@ This BEP relies on BSC's Fast Finality feature. If Fast Finality fails, it may r
 ## 7. Liveness Analysis
 The liveness of the chain remains unchanged, meaning it is required to ensure that at least (validatorN/2+1) validators are active. The proof is as follows:
 
-Given that (validatorN/2+1) validators are active, and at a certain moment none of them are allowed to produce blocks, then each validator must have produced at least n blocks within the past validatorN/2\*n blocks. Thus, collectively, within the past validatorN/2\*n blocks, there must have been at least (validatorN/2+1)\*n blocks produced, which is impossible. Therefore, at any given moment, at least one node from the set of (validatorN/2+1) must be allowed to produce blocks.
+If (validatorN/2+1) validators are active and none are allowed to produce blocks at a certain moment, each validator must have produced at least n blocks in the past ((validatorN/2+1)\*n-1) blocks. Thus, collectively, at least (validatorN/2+1)\*n blocks must have been produced, which is impossible. Therefore, at any moment, at least one of the (validatorN/2+1) validators must be allowed to produce blocks.
 
 ## 8. License
 The content is licensed under [CC0](https://creativecommons.org/publicdomain/zero/1.0/).