PNAS

FIXED-POINT THEOREMS FOR NONCOMPACT MAPPINGS IN HILBERT SPACE

Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear immediately following publication. Citation ...
PNAS

Impactor relics of CI-like chondrites in Chang’e-6 lunar samples

We found seven olivine-bearing fragments in lunar samples returned by the Chang’e-6 mission from a huge, ancient (pre-Nectarian) basin on the far-side of the Moon. We identified these uncommon clasts ...
PNAS

NONEXPANSIVE NONLINEAR OPERATORS IN A BANACH SPACE

NONEXPANSIVE NONLINEAR OPERATORS IN A BANACH SPACE*Note: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not ...
PNAS

Four decades of Antarctic Ice Sheet mass balance from 1979–2017

In the west, the glaciers feeding Wordie Ice Shelf (1.3-cm SLE) lost 1 to 2 Gt/y in 1979–2003, increasing to 8 Gt/y in 2017, with speed-up detected over the entire drainage. The mass loss for Wilkins ...
PNAS

ON MODULAR CORRESPONDENCES FOR SP(N, Z ) AND THEIR CONGRUENCE RELATIONS

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PNAS

Freezing enhances CO2 mineralization in Ca2+-containing solutions

Contributed by Joseph S. Francisco; received June 26, 2025; accepted September 12, 2025; reviewed by Jeffrey E. Dick and Shutao Wang ...
PNAS

The Principle of Microscopic Reversibility

The Principle of Microscopic ReversibilityNote: The article usage is presented with a three- to four-day delay and will update daily once available. Due to ths delay, usage data will not appear ...